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:

A and E are in the same group. B and D are in the same period.

Explanation:

In order to find the group and period you will have to write the electronic configuration for each:

A- 2,8,1

B- 2,2

C- 2

D- 2,5

E- 2,8,8,1

Elements with the same number on the last shell are in the same group. FOr example A and E which both has one electron on the last shell.

Elements with the same number of shells are in the same period. For example B and D which has two shells. They are both in Period 2.