MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
'⁶⁵₂₉A' is an isotope of which element?
Think it through first, then pick an option.
- a Si
- b Zn
- c P
- d Cu
Answer and explanation
Correct answer: d Cu
Z = 29 is copper; ⁶⁵Cu is an isotope of copper.
Why the other options are wrong
- a Si: Si has Z = 14; isotopes are told apart by Z, and Z = 29 is Cu.
- b Zn: Zn has Z = 30; the mass number 65 misleads, but Z = 29 is Cu.
- c P: P has Z = 15; an atom with Z = 29 is copper.
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