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 belong to the same group because they contain the same number of valence electrons

B and D belong to the same period because they contain the same number of valence shell

Answer 2

(i). Element A and E belong to the same group .

(ii). Element B and D belong to the same period .

• Elements whose numbers of valence electrons are same , belong to same group . Here , in A and E , number of valence electrons are same that is 1.
• Elements which have same valence shells are belong to same period .