Question

4.

	X	Y
Normal electronic configuration	2, 8,7	2,8, 2
Nature of oxide	Dissolves in water and turns blue litmus red	Very low solubility in water Dissolves in hydrochloric acid
The tendency for Oxidising and reducing reaction	Tends to oxidize elements and compounds	Tends to act as a reducing agent.
Electrical and thermal conductivity	Very poor electrical conductor. Poor thermal conductivity.	Good electrical conductor. Good thermal conductor
Tendency to form alloys and amalgams	No tendency to form alloys form alloys	Form alloys

Using the above information, complete the following:

$\_\_\_$is the metallic element.

Answer 1

1. Metals have the electronic configuration like $2,8,2$.
2. Metals have very low solubility in water but they tend to dissolve in hydrochloric acid.
3. Metals have the tendency to lose electrons and form positive ions which are oxidation so tend to act as a reducing agent.
4. Metals are also good electrical and thermal conductors.
5. Metals also form alloys.
6. These points match with Y.
7. So Y is the metallic element.