MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
In the symbol ⁵⁶₂₆Fe²⁺:
- i. Mass number 56
- ii. Number of electrons 26
- iii. Number of neutrons 30
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: b i and iii
Mass number 56 and neutrons 56 − 26 = 30 are right; the electrons are 24, not 26.
Why the other options are wrong
- a i and ii: ii is false: Fe²⁺ has lost two electrons, so it has 26 − 2 = 24.
- c ii and iii: ii is false: Fe²⁺ has 24 electrons; and i, which is true, is left out.
- d i, ii and iii: ii is false: 26 is the proton count; Fe²⁺ has 24 electrons.
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