Question

If an atom of an element has 34 electrons in total, then what is the outer most orbit of the atom and the number of valence electrons?

• A. N, 26
• B. N, 6
• C. M, 26
• D. M, 2

Answer 1

The correct option is B

N, 6

The given atom has 34 electrons. The electronic configuration using Bohr and Bury's rules is 2, 8, 18, 6.

The maximum number of electrons in each shell is as follows

K-Shell =$2$ $\times$ $1^2$=$2$

L- Shell =$2$ $\times$ $2^2$ = $8$

M- Shell = $2$ $\times$ $3^2$ =$18$

N- Shell = $2$ $\times$ $4^2$= $32$

The 34 electrons start filling from the inner orbit to the outer orbit.

So K-shell - 2 electrons, L-Shell -8 electrons, M-Shell -18 electrons and the remaining 6 electrons fill the next shell that is the N-shell.