Question

An element P(atomic no 20) reacts with an element Q(atomic no17) to form a c compound R.
(A) write the position of P and Q in the periodic table.
(B)write the molecular formula of compound R

Answer 1

P lies in the 2nd group and 4th period and q lies in the 17th group and third period the molecular formula of compound are is cacl2

Answer 2

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EXPIATION : -

An element whose atomic number is 20 is calcium. Whereas element whose atomic number is 17 is chlorine.

Calcium is placed in period 4 and group 2. On the other hand, chlorine is placed in period 3 and group 7.

Therefore, element P is calcium and element Q is chlorine.

The compound formed when P reacts with Q is .
$cacl2$
The chemical reaction is as follows.


$ca + cl2 = cacl 2$

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