Question : Which of the following pairs of 'number – composition' is correct?
I. Atomic number – number of protons
II. Mass number – Sum of number of neutrons and protons
Option 1: Only I
Option 2: Neither I nor II
Option 3: Both I and II
Option 4: Only II
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Correct Answer: Both I and II
Solution : The correct option is Both I and II.
The atomic number of an element is equal to the number of protons in its nucleus. It uniquely identifies an element.
Thus, the atomic number-number of protons statement is correct.
The mass number of an atom is the sum of its protons and neutrons. It represents the total number of particles (protons and neutrons) in the nucleus of an atom.
Thus, the mass number, or sum of the number of neutrons and protons, is also correct.
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