3. 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. (2)
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Explanation:
electronic configuration of P is
1s2 2s2 2p6 3s2 3p6 4s2
it is in s block 4 the period and 2nd group
electronic configuration of q is
1s2 2s2 2p6 3s2 3p5
it is in the p block of 3rd period in the 17th group
the compound formed is pq2 since p has to valence electrons and q only needs one more electron
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