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Railways PYQCBT 1 2016

RRB NTPC · Question 84

_______ is the most electropositive and ______ is the most electronegative element of the third period of the modern periodic table. A. Sodium, Potassium B. Magnesium, Aluminium C. Sodium, Chlorine D. Aluminium, Chlorine

  1. B

  2. D

  3. A

  4. C

Show answer & explanation

Answer: (D) C

Explanation

In the third period (Na to Ar), electropositivity decreases and electronegativity increases from left to right. So sodium is the most electropositive and chlorine the most electronegative (argon, a noble gas, is excluded).