Question

If both the first and second shells of an atom are full, what is the total number of electrons present in that atom?

Answer 1

10

Step-by-step explanation:

the capacity for each shell for the first 20 elements can be given by

2.8.8.2

2 electrons in the first shell

8 in the 2nd and in the 3rd

and 2 in the 4th

so if both the first and 2nd shells are full,

2+8=10 electrons

Answer 2

10 is the total number of electrons present in that atom.

Step-by-step explanation:

The formula for total number of electron in nth shell is given by :
`2n^2`

First shell = 1

Number of electron in first shell,n = 1:

=
`2(1)^2= 2`

Number of electron in first shell,n = 2:

=
`2(2)^2= 8`

Total number of electrons in the atom with full first shell and second shell:

2 + 8 = 10