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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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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. |
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