MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
Which carries the true identity of an atom?
Think it through first, then pick an option.
- a Electron
- b Neutron
- c Proton
- d Mass number
Answer and explanation
Correct answer: c Proton
The proton number, the atomic number, is the atom's true identity, the element's ID number.
Why the other options are wrong
- a Electron: The electron count changes when an ion forms; an atom's true identity is its proton number, the atomic number.
- b Neutron: The neutron count differs between isotopes; the identity is carried by the proton number.
- d Mass number: Isotopes of one element have different mass numbers; the identity is the proton number.
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