Question

The atomic number of three elements X, Y, Z are As:- X=5,Y=7,Z=10. Then what will be the group number of the three elements and also what will be the period of these elements and out of these three which one has smallest atomic size and why

Answer 1

X Y and Z lies in group 13,15,and 18th

and these lies in period number 2.

Z with atomic no. 10 has smallest atomic size because as we move left to right in a period the atomic size decrease.

Answer 2

X Y and Z lies in group 13,15,and 18th  

and these lies in period number 2.

Z with atomic no. 10 has smallest atomic size because as we move left to right in a period the atomic size decrease.