The elements Sodium(P), Phosphorous(Q), Chlorine(R) and Argon(S) have atomic numbers 11, 15, 17 and 18 respectively. Which of the following are reactive non-metals?

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P and R

Q and R

P and Q

R and S

answer is C.

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Detailed Solution

Phosphorus (Q), and Chlorine (R) are reactive non-metals.
Phosphorus, Chlorine are reactive non-metals, Sodium is metal and Argon is non-reactive (noble gas) because it has a stable electronic configuration and it does not require any electron to complete its octet. Phosphorus requires three electrons to complete its octet and Chlorine requires one electron for the completion of octet. Thus, they are reactive in nature.

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