Question

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20. An element forms the following compound when it rects with hydrogen, chlorine,
oxygen and phosphorous. ZH3,Z2O3 ZCI3, and ZP.
pound when it reacts with hydrogen, Chlorine,
(a) What is the valency of element Z?
(b) Element 2 is metal or non-metal? Why?
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Answer 1

the Valence of compound is +3

and element 2 is a metal

Answer 2

Answer:

Aluminium because it has valency 3 and it also reacts with hydrogen and it is a metal