Question-4
Match the atomic 4, 14, 8, 15 and 19 with each of the following:
a) A solid non-metal of valency 3
b) A gas of valency 2
c) A metal of valency 1
d) A non-metal of valency 4
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Answer:
a.15 phosphorus
b.8 oxygen
c.19 potassium
d.14 sulpher
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