Question: Elements P, Q, R, and S have atomic numbers 11, 15, 17 and 18 respectively. Which of them are reactive non-metals? i) P and Q

Elements P, Q, R, and S have atomic numbers 11, 15, 17 and 18 respectively. Which of them are reactive non-metals?

i) P and Q

ii) P and R

iii) Q and R

iv) R and S

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