Question

four elements P,Q,R,S have atomic number 12,13,14 and, 15 respectively. a) write the name of elements? b) what is the valency of R and S?
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Answer 1

Answer:

i) The valency of Q is 3 as its valence shell has three electrons in it. (ii) Elements P and Q are metals as they have 2 electrons in their valence shell and they are positively charged ions whereas elements R and S are non-metals as they gain electrons to complete their octet. (iii) P and Q will form basic oxides as they are metals