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:

11 and 19: same group

4 and 7 : same period

Explanation: