MCQ
Atomic number of an atom is equal to the $ .........$
- ANumber of protons.
- BNumber of electrons.
- ✓Both $a$ and $b$.
- DSum of proton and electron.
✓
Answer
Correct option: C.
Both $a$ and $b$.
Atomic number $(Z)$ is the number of protons in an atom. It is also equal to the number of electrons in the atom.
Atomic number $=$ number of protons
Example : the atomic number of an element is $12,$ then, its atom contains $12$ protons and $12$ electrons.
Atomic number $=$ number of protons
Example : the atomic number of an element is $12,$ then, its atom contains $12$ protons and $12$ electrons.
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