Question

The following table shows the position of six elements A,B,C,D,E and F in the Periodic Table.

Groups$\to$ Periods $\to$	1	2	3 to 12	13	14	15	16	17	18
2.	A					B			C
3.		D			E				F

Using the above table answer the following questions:
a) Which element will form only covalent compounds?
b) Which element is a metal with valency2?
c) Which element is a non-metal with valency3 ?
d) Write a common name of the family of elements C and F
e) Out of D and E, which one has a bigger atomic radius and why?

Answer 1

a) E

b) D

c) B

d) The noble gases

e) D has bigger atomic radius.The atomic radius decreases in moving from left to right along a period.This is due to an increase in nuclear charge which tends to pull the electrons closer to the nucleus and reduces the size of the atom.