MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
Which element has the same number of valence electrons and valency?
Think it through first, then pick an option.
- a Ca
- b Cl
- c S
- d Ar
Answer and explanation
Correct answer: a Ca
Ca has 2 valence electrons and valency 2 (CaCl₂).
Why the other options are wrong
- b Cl: Cl has 7 valence electrons but valency 1, so they differ.
- c S: S has the variable valencies 2, 4 and 6, so it is not "the same"; Ca is clearly 2 and 2.
- d Ar: Argon is inert and forms no compounds; it has 8 valence electrons and the book gives it no valency.
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