Question

The following table shows the position of six elements A, B, C, D, E and F in the periodic table. Groups 1 2 3 to 12 13 14 15 16 17 18 Periods 2 A B C 3 D E F
Using the above table answer the following questions:
1. Which element is a metal with valency 2?
2.Out of D and E, which one has a bigger atomic radius and why?
3.which element is least reactive?​

Answer 1

Answer:

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.