1.

The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively. Which two elements belong to the same group ? Which two elements belong to the same period ? Give reasons for your choice.

Answer»

(i) X and Z.

X and Z have zero valency hence they belong to same group: noble gases.

(ii) Y and Z. Y: 

2,4 and Z: 2,8 so, both of them belong to second period with two shells filled.



Discussion

No Comment Found