Elements P, Q, R and S have atomic numbers 11, 15, 17 and 18 respectively. Which of them are reactive non-metals?
| (a)P and Q | (b)P and R |
| (c)Q and R | (d)R and S |
"
Correct answer: (c) Q and R
Explanation: The atomic number of sodium=11. Therefore, P is sodium. Sodium is a metal.
The atomic number of phosphorus = 15. Therefore, element Q is phosphorus. It is a nonmetal as it requires 3 electrons to complete its octet.
The atomic number of chlorine =17. Therefore, element R is chlorine. It is a nonmetal as it requires one electron to complete its octet.
The atomic number of argon=18. Therefore, element S is argon. It is noble gas because it has a full-filled configuration. It is non-reactive because it does not require any electron to complete its octet.
Hence, Q and R are reactive nonmetals.
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