Question

GROUPA:
A.1s²2s²
B.1S²2S²2P⁶3S²
C.1s²2s²2p63s²3p³
D.1s²2s²2p⁶
GROUPB:
1. Which are the elements coming with in the same period
2. Which are the ones coming with in the same group?
3. Which are the noble gas elements.
4. To which group and period does the elements ‘C ‘belong
match the two groups:

Answer 1

B,C belong to same period as they are having same valence shell configuration

A,B belong to same group as the value of "n" is same

D is a noble gas element as it has octet configuration

3-period, 5-group n=3,valence electrons=5