Question

i) Three elements A. B and C have 3, 4 and 2 electrons respectively in their
outermost shell. Give the group number to which they belong in the modern
periodic table
(1) ii) How does the metallic character of elements change :
a) on moving down a group and
b) on moving across the period​

Answer 1

Answer:

i As 'A' has three electrons in outermost shell, it will be in aluminium group, that is, group thirteen. Whereas for four electrons, it will be in the group next to group thirteen that is, group fourteen and this is silicon group. Finally, we have two electrons which is in group 2.

1. ii. a. metallic character increases down a group.

b. metallic character decreases across a period.