Question

name a nonmetal that can show variable valency.Write the formula of its chlorides formed​

Answer 1

Answer:

Carbon

Valencies = 2 and 4

Its chloride = CCl4 ( Carbon Tetrachloride)

Explanation :

Since carbon has the shell configuration (2,4) having 4 electrons in it's outermost shell, therefore it shows tetravalency (4). But it's electronic configuration (1s2,2s2,2p2) shows that it has 2 electrons in its p orbital, thus showing divalent nature (2).

Its chloride = CCl4 (Carbon Tetrachloride)

Answer 2

Phosphorus is a non-metal that sits just below nitrogen in group 15 of the periodic table. This element exists in several forms, of which white and red are the best known.

valency of phosphorus is 3,5

Like most other nonmetal halides, both phosphorus chlorides react with an excess of water and yield hydrogen chloride and an oxyacid: PCl3 yields phosphorous acid H3PO3 and PCl5 yields phosphoric acid, H3PO4.