Question

(а) Опппа Boup
Which pair has both members from same period of
Periodic Table ?
(AMU)
(a) C1, Br
(b) Ca, CI
(c) Na, Ca
(d) Na, CI
The elements with atomic numbers 9 17 35 53 85​

Answer 1

Answer:

D) Na, Cl

Explanation:

The electronic version configuration of Na=2,8,1

The electronic configuration of Cl=2,8,7

Hence both have same number of shells therefore they are from same period (period 3).

Tip:

The elements with atomic masses 9,17,35,53,85