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; B and D are in the same group because their outermost no of electron is same but shell no. increases by 1.

Explanation:

B and D are in the same period because the outer most shell is the same( i.e L ).

hope it helps u