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An element P (atomic number 20) reacts w...

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 and the molecular formula of the compound formed when P reacts with Q.

Text Solution

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Position of P Group - 2 Because it has 2 valence electrons/ 2, 8, 8, 2
Period - 4 Because it has 4 shells 8, 8, 2
Position of Q Group - 17 Because it has 7 valence electrons/ 2, 8, 7
Period - 3 Because it has 3 shells/ 2,8,7
Formula `PQ_2` - Because valence of P is 2 and that of Q is 1
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