Question

The following data represents the distribution of electrons, protons and neutrons in atom

of four elements A, B, C, D.

Elements Protons Neutrons Electrons

A 19 21 19

B 17 18 17

C 17 20 17

D 18 22 18

Answer the following questions:

i) Describe the electronic distribution of in atoms of element B, C & D.

ii) Is element B a metal or a non-metal? Why?

iii) Which two elements form a pair of Isotopes?

iv) Which two elements form a pair of Isobars?​

Answer 1

Explanation:

electronic distribution of B=2,8,7

electronic distribution of C=2,8,7

electronic distribution of D=2,8,8

B and C form the pair of isotopes

A and D form the pair of isobars

Answer 2

Answer:

Explanation:

i) electronic configuration of B is : 2,8,7

  electronic configuration of C is : 2,8,7

  electronic configuration of D is :2,8,8

ii) b is a non metal because b is chlorine it cannot gain any ions.

iii) isotopes - B and C.

iv) isobars - A and D