MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
Which is the symbol of element 'A'?
Think it through first, then pick an option.
- a Cr
- b V
- c Fe
- d Mn
Answer and explanation
Correct answer: c Fe
A²⁺ is ...3d⁶ (24 electrons), so A has 26: Fe.
Why the other options are wrong
- a Cr: Cr²⁺ has 3d⁴ (22 electrons); the ion with d⁶ is Fe²⁺.
- b V: V²⁺ has 3d³; the ion with d⁶ is Fe²⁺.
- d Mn: Mn²⁺ has 3d⁵; the ion with d⁶ is Fe²⁺.
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