An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason :

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An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason :

Write the position of P and Q in the Modern Periodic Table.


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Salim Ahmed Kawsar

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Position of P Group-2 Because it has 2 valence electrons/ 2, S, 8, 2
Period-4 Because it has 4 shells/2,8,8,2
Position of Q Croup-17 Because it has 7 valence electrons/ 2, 8, 7
Period-3 Because it has 3 shells/ 2, 8,7
Formula PQ2 Because valency of P is 2 and that of Q is 1

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