Chemistry291

 8 (Eight) Explanation: A neutral atom of fluorine has seven valence electrons.But for a negative charged fluoride, F-,ion has just one more electron.That is, F- has eight valence electrons.

 Each carbon atom has 4 valence electrons. Explanation: To find out valence electrons of carbon,you need to look at the periodic table.For main group element,the group number is equal to the number of  valence electrons. The element carbon is in group 4A,that is why it has four valence electrons(Just skip the letter A).If you say carbon is in group 14,then you need to consider unit place digit 4 for valence electrons. Now I will show you how to find valance electrons of carbon from electron configuration. The atomic number of carbon is six.So it has six protons and six electrons. If you write electron configuration of carbon,the you will get the following: C ---> 1s² 2s² 2p² We know that valence electrons are the electrons that are found in the valence shell.Valence shell is the outter most shell. We can easily found the outter most shell or valence shell considering the highest value of principal quantum number,n. From C electron configuration,we see that the highest value...

In the element with the  electron configuration  1s2 2s2 2p6 3s2 3p4 has 6 valence electrons. Explanation: From 1s2 2s2 2p6 3s2 3p4 ,we see that the highest value of n is 3 ,for n=3 ,we get 3s2 3p4 .We know that the highest value of n indicates the valence shell and the electrons that are in valence shell are called valence electrons.So, the element with the  electron configuration 1s2 2s2 2p6 3s2 3p4 has (2+4=6) 6 valence electrons.

  Solution: The formal charge of hydrogen (H) and oxygen(O) in H2O is zero. Explanation: In this post,I am going to show you  how to calculate formal charge   of each atom in H2O. To find the formal charge of a atom from H2O  Lewis structure,you need to apply the following  formal charge formula or equation : ●Formal charge  = Valence electrons in neutral atom - 1/2 (Bonding Electrons) - Nonbonding  electrons   Consider the best Lewis structure of  H2O molecule.Here you need to calculate the formal charge of oxygen atom and Hydrogen atom. Or, Formal charge of H atom in H2O: ●The number of valence electrons in a neutral H atom is 1 as it is the element of group IA. ●Nonbonding electrons of H is 0. ●Bonding electrons of H is 2. ● Formal charge of H  = Valence electrons in neutral H atom - 1/2 (Bonding Electrons of H) -  Nonbonding electrons of H                =1 - 1/2(2) - 0   ...

  In this  post I will discuss how to  calculate the formal charge of C and O atom from the Best CO Lewis structure. To find the formal charge of C and O atom from CO Lewis structure,you need to apply the following formal charge formula: ●Formal charge  = Valence electrons in neutral atom - 1/2 (Bonding Electrons) - Nonbonding electrons Consider the best Lewis structure of CO molecule.Here you need to calculate the formal charge of oxygen atom and carbon atom. Best CO Lewis Structure Formal charge of O atom in CO: ●The number of valence electrons in a neutral oxygen atom is 6 as it is the element of group VIA. ●Number of Nonbonding electrons of O is 2. ●Number of bonding electrons of O is 6. ● Formal charge of O  = Valence electrons in neutral O atom - 1/2 (Bonding Electrons of O) -  Nonbonding electrons of O                 =6 - 1/2(6) - 2                 =6 -3 -2   ...

Solution: Ca    has two valence electrons.

A nswer:   K    has one valence electron. Explanation: To find out the number of valence electrons in a K atom,we need to look at the periodic table. The position of K in the periodic table  is in group IA.For main group elements,valence electrons are equal to the group number.So,potassium atom has one valence electron in its valence shell or outermost energy level. K is an element of group 1A.Now just consider the unit place digit from group number.You are getting 1 which is equal to the number of valence electrons in potassium. Here is the another way to find out the valence electrons of K. The symbol of potassium is K and the atomic number of potassium is 19.So,it has nineteen electrons totally. Now do the electronic configuration of potassium. K(19)  =1s2  2s2 2p6  3s2 3p6  4s1              =[Ar] 4s1 The valence shell is the outermost shell and the electrons that are present in valence shell is...

Solution: Ar    has eight valence electrons. Explanation: To find out the number of valence electrons in a Ar atom,we need to look at the periodic table. The position of Ar in the periodic table  is in group VIIIA.For main group elements,valence electrons are equal to the group number.So,Ar atom has eight valence electrons in its valence shell. Ar is an element of group 18.Now just consider the unit place digit from group number.You are getting 8 which is equal to the number of valence electrons in Ar. Here is the another way to find out the valence electrons of argon. The symbol of argon is Ar and the atomic number of argon is 18.So,it has eighteen electrons totally. Now do the electronic configuration of argon. Ar(18)  =1s2  2s2 2p6  3s2 3p6              =[Ne] 3s2  3p6 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell...

Answer: Si has four valence electrons. Explanation: To find out the number of valence electrons in a Si atom,we need to look at the periodic table. The position of Si in the periodic table  is in group IVA.For main group elements,valence electrons are equal to the group number.So,Si atom has four valence electrons in its valence shell. Si is an element of group 14.Now just consider the unit place digit from group number.You are getting 4 which is equal to the number of valence electrons in silicon. Here is the another way to find out the valence electrons of Si. The symbol of silicon is Si and the atomic number of silicon is 14.So, it has fourteen electrons totally. Now do the electronic configuration of silicon. Si(14)  =1s2  2s2 2p6  3s2 3p2              =[Ne] 3s2  3p2 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell or energy...

Answer: Ne  has eight valence electrons. Explanation: To find out the number of valence electrons in a Ne  atom,we need to look at the periodic table. Ne  is an element of group 18.Now just consider the unit place digit from group number.You are getting 8 which is equal to the number of valence electrons in neon. Here is the another way to find out the valence electrons of Ne. The symbol of neon is Ne and the atomic number of neon is 10.So, it has nine electrons totally. Now do the electronic configuration of neon. Ne(10) =1s2  2s2 2p6 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell or energy level can be identified by the highest value of principal quantum number ,n.Here the highest value of n is 2.So, the valence shell is the 2nd shell. In 2nd shell we get 8 valence electrons.So each Ne  has eight valence electrons. Next .            ...

Answer : Sr    has two valence electrons. Explanation: To find out the number of valence electrons in a Sr atom,we need to look at the periodic table. The position of Sr in the periodic table is in group IIA.For main group elements,valence electrons are equal to the group number.So,Sr atom has two valence electrons in its valence shell or outermost energy level. Again, Sr is an element of group 2.Now just consider the unit place digit from group number.You are getting 2 which is equal to the number of valence electrons in Sr. Here is the another way to find out the valence electrons of Sr. The symbol of strontium is Sr and the atomic number of Sr is 38.So,it has thirty eight electrons totally. Now write the electronic configuration of Sr. Sr(38)  =1s2  2s2 2p6  3s2 3p6  4s2 3d10 4p6  5s2              =[Kr] 5s2 [Tip: Complete filled d orbital is not considered as part of  valence shell or energy level] The va...

Answer: N has five valence electrons. Explanation: To find out the number of valence electrons in a N atom,we need to look at the periodic table. The position of N in the periodic table  is in group VA.For main group elements,valence electrons are equal to the group number.So a nitrogen atom has five valence electrons in its valence shell. N is an element of group 15.Now just consider the unit place digit from group number.You are getting 5 which is equal to the number of valence electrons in N. Here is the another way to find out the valence electrons of N. The atomic number of N is 7.So, it has seven electrons totally. Now do the electronic configuration of nitrogen. N(7) =1s2  2s2 2p3 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell or energy level can be identified by the highest value of principal quantum number ,n.Here the highest value of n is 2.So, the valence shell is the 2...

Answer:  Be has two valence electrons. Explanation: Be atom has two valence electrons.These electrons are important for beryllium to form bonds with other atoms. To find out the number of valence electrons in a Be atom,we need to look at the periodic table. The position of beryllium in the periodic table  is in group 2A.For main group elements,valence electrons are equal to the group number.So a Be atom has two valence electrons in its valence shell. Again,Be is an element of group 2.Now just consider the unit place digit from group number.You are getting 2 which is equal to the number of valence electrons in beryllium. Here is the another way to find out the number of valence electrons of Be. The atomic number of Be is 4.So it has four electrons totally. Now write the electronic configuration of Be. Be(4) =1s2  2s2  The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell or ener...

Answer:  Lithium has one valence electron. Explanation: To find out the number of valence electrons in a Li  atom,we need to look at the periodic table. The position of Li in the periodic table  is in group 1A.For main group elements,valence electrons are equal to the group number.So a lithium atom has one valence electron in its valence shell. Again,Li  is an element of group 1.Now just consider the unit place digit from group number.You are getting 1 which is equal to the number of valence electron in  l ithium . Here is the another way to find out the valence electrons of Li. The atomic number of Li is 3.So it has three electrons totally. Now write the electronic configuration of Li. Li(3) =1s2  2s1 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell or energy level can be identified by the highest value of principal quantum number ,n.Here the highest value of n ...

Answer: Helium has two valence electrons in its   outermost   shell .  Explanation: Here is the way on how to find the valence electron for He. To find out the number of valence electrons in a He   atom,we need to look at the periodic table. He is an element of group 18.Now just consider the unit place digit from group number.You are getting 8 which should be equal to the number of valence electrons in helium.But 8 is not the number of valence electrons  for helium. By looking at the group number,you will not be able to find out the valence electrons of helium. Here is the another way to find out the valence electrons of  He. The atomic number of helium is 2.So it has two electrons totally. Now write the electronic configuration of carbon. He(2) =1s2 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell or energy level can be identified by the highest value of princip...

Answer: Hydrogen has one valence electron.  Explanation: Here is the way on how to find the valence electron for hydrogen. To find out the number of valence electrons in a H atom,we need to look at the periodic table. The position of  H in the periodic table  is in group 1A.For main group elements,valence electrons are equal to the group number.So a H atom has one valence electron in its valence shell. Again, H is an element of group 1.Now just consider the unit place digit from group number.You are getting 1 which is equal to the number of valence electrons in hydrogen.  Here is the another way to find out the valence electrons of H. The atomic number of hydrogen is 1.So it has one electron totally. Now do the electronic configuration of carbon. H(1) =1s1 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell or energy level can be identified by the highest value of principal quantu...

  Answer: Al has three valence electrons. Explanation: To find out the number of valence electrons in a Al atom,we need to look at the periodic table. The position of Al in the periodic table  is in group 3A.For main group elements,valence electrons are equal to the group number.So,Al atom has three valence electrons in its valence shell. Al is an element of group 13.Now just consider the unit place digit from group number.You are getting 3 which is equal to the number of valence electrons in aluminum. Here is the another way to find out the valence electrons of aluminum. The symbol of aluminum is Al and the atomic number of aluminum is 13.So, it has thirteen electrons totally. Now do the electronic configuration of Al. Al(13)  =1s2  2s2 2p6  3s2 3p1              =[Ne] 3s2  3p1 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence she...

  Answer: Mg has two valence electrons. Explanation: To find out the number of valence electrons in a Mg atom,we need to look at the periodic table. The position of Mg in the periodic table  is in group IIA.For main group elements,valence electrons are equal to the group number.So,Mg atom has two valence electrons in its valence shell. Magnesium is an element of group 2.Now just consider the unit place digit from group number.You are getting 2 which is equal to the number of valence electrons in Mg. Here is the another way to find out the valence electrons of Mg. The symbol of sodium is Mg and the atomic number of magnesium is 12.So, it has twelve electrons totally. Now do the electronic configuration of Mg. Mg(12)  =1s2  2s2 2p6  3s2              =[Ne] 3s2 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence shell or energy level can be ident...

  Answer : P has five valence electrons. Explanation: To find out the number of valence electrons in a P atom,we need to look at the periodic table. The position of  P in the periodic table  is in group VA.For main group elements,valence electrons are equal to the group number.So,P atom has five valence electrons in its valence shell. P is an element of group 15.Now just consider the unit place digit from group number.You are getting 5 which is equal to the number of valence electrons in phosphorus. Here is the another way to find out the valence electrons of P. The symbol of phosphorus is P and the atomic number of phosphorus is 15.So,it has fifteen electrons totally. Now do the electronic configuration of phosphorus. P(15)  =1s2  2s2 2p6  3s2 3p3              =[Ne] 3s2  3p3 The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons. The valence ...

  Answer:   Chlorine   has seven valence electrons. Explanation: To find out the number of valence electrons in a Cl atom,we need to look at the periodic table. The position of chlorine in the periodic table  is in group VIIA.For main group elements,valence electrons are equal to the group number.So,Cl atom has seven valence electrons in its valence shell. Cl is an element of group 17.Now just consider the unit place digit from group number.You are getting 7 which is equal to the number of valence electrons in chlorine. Here is the another way to find out the valence electrons of chlorine. The symbol of chlorine is Cl and the atomic number of chlorine is 17.So,it has seventeen electrons totally. Now do the electronic configuration of chlorine. Cl(17)  =1s2  2s2 2p6  3s2 3p5              =[Ne] 3s2  3p5 The valence shell is the outermost shell and the electrons that are present in valence shell is ca...