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1. a. p will have valency +2
Q will have valency 4
R will have valency -1
because group 2 elements have 2 valence electrons and they are metals so they losses 2 electrons to full fill their outer most shell. but group 14 and 17 elements have 4 and 7 valence electrons respectively and they are non metals so they gains 4 or 3 electrons to full fill their outer most shell.
2. a. basic oxide,b. acidic oxide , c. acidic oxide
because P is metal and QR are non metals
3.magnesium , carbon ,florine
4.
niki9513:
buttt reason also tell
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