Four elements P, Q, R and S have atomic numbers 12,13,14 and 15 respectively. Answer the following questions giving reasons :
Four elements P, Q, R and S have atomic numbers 12,13,14 and 15 respectively.
Answer the following questions giving reasons :
(i) What is the valency of Q ?
(ii) Classify these elements as metals and non-metals.
(ii) Which of these elements will form the most basic oxide ?
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(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.
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