Chemistry291

Given the electron configuration of an atom 1s2 2s2 2p6 3s2 3p6 4s1 ,which is its valence shell? Answer: Given, the electron configuration of an atom is 1s2 2s2 2p6 3s2 3p6 4s1. To find valence shell,you need to find the highest value of principal quantum number.Here the highest value of principal quantum number n is 4.That is why the valence shell from  electron configuration   1s2 2s2 2p6 3s2 3p6 4s1 is the fourth shell (4s1).

How many valence electrons are there in 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2 ? Answer: The element with the electron configuration of  1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2  has four valence electrons.But it has totally 32 electrons. Explanation: Given,  1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2 At first,find out the Valence shell.Here, the fourth shell is the valence shell 4s24p2.We know that the electrons in valence shell are called valence electrons.Here we get four valence electrons in 4s24p2.That is why t he element with the electron configuration of  1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2  has four valence electrons. Remember that the electrons in fullfiled d orbital are not counted as valence electrons.A d orbital can hold maximum 10 electrons. 

What does the 4 mean in 3p4? Answer: The number 4 in 3p4 means that there are four electrons in the p-orbital of third shell.

How many electrons does 1s2 2s2 2p6 3s2 3p4 have? Answer: The element with the electron configuration of  1s2 2s2 2p6 3s2 3p4  has six valence electrons.But it has totally 16 electrons. Explanation: Given,  1s2 2s2 2p6 3s2 3p4 At first,find out the Valence shell.Here, the third shell is the valence shell 3s23p4.We know that the electrons in valence shell are called valence electrons.Here we get six valence electrons in 3s23p4.That is why t he element with the electron configuration of  1s2 2s2 2p6 3s2 3p4  has six valence electrons.

  H ow many shells are there in  1s2 2s2 2p6 3s2 3p1? Answer: There are three shells in  1s2 2s2 2p6 3s2 3p1. ●First shell 1s2 ●Second shell 2s22p6 ●3rd shell 3s23p1

How many valence electrons are present in the atom with the following electron configuration 1s2 2s2 2p6 3s2 3p5? Answer: The element with the electron configuration of  1s2 2s2 2p6 3s2 3p5  has seven valence electrons.But it has totally 17 electrons. Explanation: Given,  1s2 2s2 2p6 3s2 3p5 At first,find out the Valence shell.Here, the third shell is the valence shell 3s23p5.We know that the electrons in valence shell are called valence electrons.Here we get seven valence electrons in 3s23p5.That is why t he element with the electron configuration of  1s2 2s2 2p6 3s2 3p5  has seven valence electrons.

How many valence electrons are there in 1s2 2s2 2p6 3s2 3p6 4s2? Answer: The element with the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 has two valence electrons.But it has totally 20 electrons. Explanation: Given,  1s2 2s2 2p6 3s2 3p6 4s2 At first,find out the Valence shell.Here, the fourth shell is the valence shell 4s2.We know that the electrons in valence shell are called valence electrons.Here we get two valence electrons in 4s2.That is why t he element with the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 has two valence electrons.

How many total electrons and valence electrons does an element with the electron configuration 1s2 2s2 2p6 3s2 3p4 have? Answer: The element with the electron configuration of 1s2 2s2 2p6 3s2 3p4 has six valence electrons.But it has totally 16 electrons. Explanation: Given,  1s2 2s2 2p6 3s2 3p4 At first,find out the Valence shell.Here, the third shell is the valence shell  3s2 3p4.We know that the electrons in valence shell are called valence electrons.Here we get six valence electrons in 3s2 3p4.That is why t he element with the electron configuration of 1s2 2s2 2p6 3s2 3p4 has six valence electrons.

  How many valence  electrons does the  element with the  electron configuration  of 1s2 2s2 2p6 3s2 have? Answer: The element with the electron configuration of 1s2 2s2 2p6 3s2 has two Valence Electrons. Explanation: Given,  1s2 2s2 2p6 3s2 At first,find out the Valence shell.Here, third shell is the valence shell  3s2.We know that the electrons in valence shell are called valence electrons.Here we get two valence electrons in 3s2.That is why t he element with the electron configuration of 1s2 2s2 2p6 3s2 has two valence electrons.

Answer: 0.25 as a fraction is 1/4 . Explanation: To express decimal 0.25 as a fraction,you need to follow the following steps.Here are the steps:              Step-1: Drop the decimal and write obtained number as numerator. 25/             Step-2: Now write the place value of the last digit as denominator.For 0.25,the last digit is 5 and the place value for 5 is hundredths ( 1/100). 15/100 Or,for every digit after decimal point, consider 10.Remember that you need to multiply all the 10s. Step-3: Now reduce the fraction to its lowest term. 25/(10×10) Here,the last digit of 25 is 5.So,it is divisible by 5. So,5×5 = 25 Now rewrite, So,after reducing we are getting 1/4 .So,0 .25 as a fraction is 1/4 . Next What is 2 5 as a fraction? Answer: 25 as a fraction is 25/1. Explanation: Here 25 is a whole number,We can express any whole number as a fraction considering 1 as a denominator.So ,if you want to express the whole number 2 5 as a fraction,you need to write 25/1.

Answer: 1.5 as a fraction is 3/2 . Explanation: To express decimal 1.5 as a fraction,you need to follow the following steps.Here are the steps: Step-1: Drop the decimal and write obtained number as numerator. 15/ Step-2: Now write the place value of the last digit as denominator.For 1.5,the last digit is 5 and the place value for 5 is tenths ( 1/10). 15/10 Or,for every digit after decimal point, consider 10.Remember that you need to multiply all the 10s. Step-3: Now reduce the fraction to its lowest term. 15/10 Here,the last digit of 15 is 5.So,it is divisible by 5. So,3×5 = 15 Now rewrite, So,after reducing we are getting 3/2 .So,1 .5 as a fraction is 3/2 . ●1.5 as a improper fraction is 3/2 ●1.5 as a mixed number is 1 1/2 Next

Answer: .125 as a fraction is 1/8 . Explanation: To express decimal .125 as a fraction,you need to follow the following steps.Here are the steps:              Step-1: Drop the decimal and write obtained number as numerator. 125/             Step-2: Now write the place value of the last digit as denominator.For .125,the last digit is 5 and the place value for 5 is thousandths ( 1/1000). 125/1000 Or,for every digit after decimal point, consider 10.Remember that you need to multiply all the 10s.            Step-3: Now reduce the fraction to its lowest term. 125/(10×10×10) Here,the last digit of 125 is 5.So,it is divisible by 5. So,5×25 = 125 Now rewrite, Here,the last digit of 25 is 5.So,it is divisible by 5. So,5×5 = 25 Now rewrite, So,after reducing we are getting 1/8 .So, .125 as a fraction is 1/8 . Next Some Questions and Answers ● What is 12 5 as a Fraction? Answer: 125 as a fraction is 125/1. Explanation: Here 125 is a whole number,We can express any whole number as a fraction consi

Answer: .625 as a fraction is 5/8 .You can say that the fractional equivalent of .625 is 5/8. Explanation: To express decimal .625 as a fraction,you need to follow the following steps.Here are the steps:                  Step-1: Drop the decimal and write obtained number as numerator. 625/                Step-2: Now write the place value of the last digit as denominator.For .625,the last digit is 5 and the place value for 5 is thousandths ( 1/1000). 625/1000 Or,for every digit after decimal point, consider 10.Remember that you need to multiply all the 10s.                 Step-3: Now reduce the fraction to its lowest term. 625/(10×10×10) The last digit of 625 is 5.So,it is divisible by 5. So,125×5 =625 Now rewrite, The last digit of 125 is 5.So,it is divisible by 5. So,5×25 =125 Now rewrite, So,after reducing we are getting 5/8 .So,.625 as a fraction is 5/8 . Next What is 62 5 as a fraction  in simplest form? Answer: 625 as a fraction is 625/1. Explanation: Here 625 is a whole number,W

  Is H2S polar or nonpolar? Answer : H2S is a polar molecule.Again,hydrogen sulphide is polar molecule because of its bent shape(V type shape) which makes the net molecular dipole moment non zero.Again,Since H2S has net molecular dipole moment,H2S is polar. Explanation: Here are the few steps that you help you to determine that hydrogen sulphide,H2S, is a polar molecule.            Step-1: Draw the Lewis structure of H2S.              Step-2: After drawing Lewis structure of H2S,now you need to consider the electronegativity difference between atoms. Here sulphur is more electronegative than hydrogen.So,every  sulphur-hydrogen bond is polar.                Step-3: Now consider bond dipole moment. As both sulphur- hydrogen bonds are polar,every bond has a dipole moment.              Step-4: Now consider the geometry or shape of H2S molecule by applying VSEPR theory. According to VSEPR theory,we get bent shape or geometry of H2S.                  Step-5: Now consider the net molecular di

  Is CO polar or nonpolar? Answer: CO (Carbon monoxide) is a polar molecule.Remember that if the dipole moment of a bond is symmetrically cancelled out by an equal and opposite dipole moment of another bond, then we get net molecular dipole moment zero.Thus the overall compound is non polar. Like in the case of C02  which is nonpolar. In the case of CO,  the oxygen is more electronegative than carbon.That is why carbon-oxygen bond is polar.So this has bond dipole moment. According to VSEPR theory,the shape of CO is linear.So,we are not getting anything that can cancel the bond  dipole moment of carbon-oxygen bond of linear CO molecule. Thus the net molecular dipole moment for CO molecule is not zero.Therefore ,CO (Carbon monoxide) is polar.

W hich of the following statements is true? A)The charge of electron is positive. B)Only valence electrons take part in chemical reaction. C)The charge of proton is negative. D)A neutron has positive charge. Answer: The following statement (B) is true.The statement (B)  is only  valence electrons take part in chemical reaction .

Is H2O polar or nonpolar? Answer : H2O is a polar molecule.Again,water is polar molecule because of its bent shape(V type shape) or  geometry which makes the net molecular dipole moment non zero.Again,Since H2O has net molecular dipole moment,H2O is polar. Explanation: Here are the few steps that you help you to determine that water,H2O, is a polar molecule.            Step-1: Draw the Lewis structure of H2O.              Step-2: After drawing Lewis structure of H2O,now you need to consider the electronegativity difference between atoms. Here oxygen is more electronegative than hydrogen.So,every  oxygen-hydrogen bond is polar.                Step-3: Now consider bond dipole moment. As both oxygen and hydrogen bonds are polar,every bond has a dipole moment.              Step-4: Now consider the geometry or shape of H2O molecule by applying VSEPR theory. According to VSEPR theory,we get bent shape or geometry of H2O.                  Step-5: Now consider the net molecular dipole moment.

Is CO2 polar or nonpolar? Answer : CO2 is a nonpolar molecule.Again,Carbon dioxide is nonpolar because of its linear geometry which makes the net molecular dipole moment zero. Explanation: Here are the few steps that you help you to determine that carbon dioxide,CO2, is a non polar molecule.            Step-1: Draw the Lewis structure of CO2.              Step-2: After drawing Lewis structure of CO2,now you need to consider the electronegativity difference between atoms. Here oxygen is more electronegative than carbon.So,every  carbon-oxygen bond is polar.                Step-3: Now consider bond dipole moment. As both carbon and oxygen bonds are polar,every bond has a dipole moment.              Step-4: Now consider the geometry of CO2 molecule by applying VSEPR theory. According to VSEPR theory,we get linear geometry of CO2.                  Step-5: Now consider the net molecular dipole moment. As the shape of CO2 is linear,one bond dipole moment cancel another bond's dipole mome