Question

Observe the given table and answer the following question :Elements A, B, C, D, E Atomic number 11, 4, 2, 7, 19 Identify the two elements that belong to the same period and the two elements that belong to the same group. Give reason for your conclusion. ​

Answer 1

Answer:

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Answer 2

Answer:

A and E belong to same group.

B and D belong to same period.

Explanation:

If we write the electronic configuration of A and E,

A= 2)8)1

E=2)8)8)1

Here A and C has valancy 1 and group 1 elements has valancy 1. Therefore A and E belong to same group.

Now consider elements B and D and write their electronic configuration using Aufbau's principle

B=1s^2 2s^2

D=1s^2 2s^2 2p^3

Here last shell has n (principal quantum number) is same(2) so B and D belong to same period.