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Four elements P, Q, R and S have atomic ...

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.
(iii) Which of these elements will form the most basic oxide?

Text Solution

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(i) Valency of Q is 3 as Q loses 3 electrons to obtain insert gas configuration.
(ii) P and Q are metals as these elements lose 2 and 3 electrons respectively to obtain insert gas configuration and those elements which lose electrons are metals.
R and S are non-metals as these elements either share or gain electrons for attaining inert gas configuration and those metals which accept electrons either by sharing or gaining are non-metals.
(iii) Element P will form the most basic oxide beacuse P is the most metallic element among the 4 given elements and thus forms the most basic oxide.
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