Elements A,B,C,D and E have atomic numbers 4,14,18,15 and 19.
Answer the following: (5)
(i) name a gas of valency 2
(ii) write the formula of compound between C and E
(iii) name a non-metal of valency 4
(iv) write the formula of compound between C and D
(v) name the metal with one electron in its N shell.
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