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

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.

Text Solution

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(a) The electronic configuration of the elements P and Q are as follows :
P (Z = 20) 2, 8, 8, 2, Q (Z = 17) 2, 8, 7 The element P (Ca) is present in group 2 and period 4 whereas Q (Cl) belongs to group 17 and period 3.
(b) The molecular formula of the compound is `PQ_(2)." It is "CaCl_(2).`
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Knowledge Check

  • An element X with atomic number 12 forms a compound with element Y with atomic number 17. The formula of the compound formed is

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