If two atoms are isotopes of the same element, they have the same number of but will have different numbers of
a. protons; neutrons
b. neutrons; electrons
c. neutrons; protons

Answer : The correct option is, (A) protons ; neutrons

Explanation :

Isotopes : It is defined as the two atoms are isotopes of the same element when they have the same number of protons and electrons and the number of neutrons will be different.

For example : Carbon-12 and Carbon-13.

Carbon-12

Atomic number = 6

Atomic mass = 12

Number of protons = Atomic number = 6

Number of neutrons = Atomic mass - Atomic number = 12 - 6 = 6

Carbon-13

Atomic number = 6

Atomic mass = 13

Number of protons = Atomic number = 6

Number of neutrons = Atomic mass - Atomic number = 13 - 6 = 7

Thus, we conclude that the number of protons are same but number of neutrons a re different in carbon-12 and carbon-13.

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