Four elements p,q,r,s have atomic number 12,13,14,15 respectively. What is valency of q
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vallecy is 3S1 3P2
Explanation:
1S2,2S2 2P6,3S1 3P2
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Valency of element Q
From the atomic number of Q, it is identified as Aluminium.
As its atomic number is 13, its electron distribution pattern is 2,8,3.
As it has 3 electrons in its outer most shell, it readily loses them to attain octet.
Thus its valency is identified as +3.
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