Chemistry291

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 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: 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/...

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 the formula of sodium hydroxide? Answer : NaOH is the formula of sodium hydroxide. Next

    The sum of 4 consecutive integers is 326. What is the second number in this sequence? Solution: We need to find out the  second  number    from    consecutive integer numbers' sequence.                          Step-1: We have to have knowledge about integer number.An integer number does not have any fractional part.It can be positive or negative number. Now you have to understand about consecutive integer number.The difference between two consecutive integer numbers    is always 1.                    Step-2: Say,the first integer number is x. So, the second integer number will be x+ 1. Thus, the third consecutive integer number will be x+2  .Besides,the fourth integer number will be x+3. Have a look here. The fo...

   The sum of 5 consecutive even numbers is 200. What is the fifth number in this sequence?   Solution: We need to find out the third number    from    consecutive even number sequence.                          Step-1: We have to have knowledge about even number . If you divide a even number by 2 ,you will get a remainder of 0. Now you have to understand about consecutive even number.The difference between two consecutive even number    is always 2.                      Step-2: Say,the first even number is x. So ,the second even number will be x+ 2. Thus, the third , fourth and fifth consecutive even number will be x+4  ,  x +6 and x+ 8 respectively. Have a look here. The five consecutive even numbers are x, x+2,x+4 , x+6 and x +8...

Hydrochloric Acid and Potassium Hydroxide Balanced Equation Answer: HCl + KOH -->KCl+H₂O is the balanced equation for Hydrochloric acid and potassium hydroxide . Explanation: Today we are going to Balance hydrochloric acid and potassium hydroxide (HCl+KOH) reaction in just six steps. Here is the reaction between HCl and KOH.                       HCl + KOH →KCl+H₂O                                         Step-1: Write the equation like this and count atoms from both sides. HCl + KOH →KCl+H₂O Reatants                 Products                       H  → 1+1=2                 H  → 2 Cl →1                  ...