MCQ
Atomic number of elements represent
- ✓Number of protons in the nucleus
- BNumber of neutrons in the nucleus
- CNumber of protons and neutrons in nucleus
- DThe valency of an element
✓
Answer
Correct option: A.
Number of protons in the nucleus
a
Atomic number of an element represents the number of protons in the nucleus. It is also equal to the number of electrons in neutral atom. The number of neutrons is equal to the difference between mass number and atomic number.
Atomic number of an element represents the number of protons in the nucleus. It is also equal to the number of electrons in neutral atom. The number of neutrons is equal to the difference between mass number and atomic number.
For example, for ${ }_{17}^{37} Cl$, the atomic number is $17$, the mass number is $37$ , there are $17$ , electrons, $17$ protons and $37-17=20$ neutrons.
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