Question

Electron distribution of
two elements P and Q in
their outermost shell is
shown below.
N shell
M shell
p
р
Р
Atomic numbers of P and
Q are respectively​

Answer 1

Answer:

P has 5 electrons in the second shell (n=2) , thus the electronic configuration is: 2,5 and atomic no. =7

Q has 5 electrons in the third shell (n=3) , thus the electronic configuration is: 2,8,5 and atomic no. =15