Question

1. isotopes are atoms of the same element that have different

a. principal chemical properties.
b. numbers of protons.
c. masses.
d. numbers of electrons.

Explanation:

Define isotopes

$$ \text{Isotopes} = \text{atoms of the same element with the same number of protons but different numbers of neutrons} $$

Relate to atomic mass

$$ \text{Atomic Mass} = \text{protons} + \text{neutrons} $$

$$ \text{Different number of neutrons} \implies \text{different atomic masses} $$

Evaluate options

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Answer:

• a. principal chemical properties.
• b. numbers of protons.
• c. masses. (Correct answer)
• d. numbers of electrons.