Question

When an element X ( at. no.17) reacts with another element Y (at. no.13),the chemical formed is.
a) XY
b) X2Y
c) YX3
d) XY3

Answer 1

Answer:

The element X is Chlorine(Cl)having atomic number 17 and valency 1 and the Element Y is Aluminum(Al) having atomic number 13 and valency 3.

So,when aluminium and chlorine react with each other they form aluminium chloride. ( AlCl3).

This resembles option 4.

Note- You can also find the chemical compound formed by crossing over the valencies.

Answer 2

Answer:

option 4

Explanation:

The element X is Cl at 17 and have valency 1.

The element Y is Al at 13 and have valency 3.

So the exchange their valency and form AlCl3