Read the statement and answer the following question:
Match the atomic numbers A=4, B= 14, C= 8, D= 15 and E=19 with each of the following:
State (i) solid non-metal of valency 3
(ii) a gas of valency 2
(iii) metal of valency 1
(iv) non-metal of valency 4
(v) Formula of compound between A and D
please answer its urgent
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Valencies