An element P(atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reasons : (a) Write the positions of P and Q in the Modern Periodic Table. (b) Write the molecular formula of the compound when P reacts with Q.

An element P(atomic number 20) reacts with an element Q (atomic number

1.	An element P(atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reasons : (a) Write the positions of P and Q in the Modern Periodic Table. (b) Write the molecular formula of the compound when P reacts with Q.
Answer» Element P : Electronic configuration : 2, 8, 8, 2 So, element P belongs to `4^(th)` period and group 2, as it has four shells and 2 valence electrons. Element Q : Electronic configuration : 2, 8, 7 So element Q belongs to `3^(rd)` period and group 17, as it has three shells and seven valence electrons. Molecular formula of compound will be `PQ_(2)`. As valency of P is 2 and valency of Q is one.

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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 reasons : (a) Write the positions of P and Q in the Modern Periodic Table. (b) Write the molecular formula of the compound when P reacts with Q.

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