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  • In a sample of ethyl ethanoate ( {CH}_{3} {COOC}_{2} {H}_{5} ) the two oxygen atoms have the same number of electrons but different number of neutrons, which of the following is the correct reason for it?

In a sample of ethyl ethanoate \left ( \text {CH}_{3}\text {COOC}_{2}\text {H}_{5} \right ) the two oxygen atoms have the same number of electrons but different number of neutrons, which of the following is the correct reason for it?
(a) One of the oxygen atoms have gained electrons
(b) One of the oxygen atoms has gained two neutrons
(c) The two oxygen atoms are isotopes
(d) The two oxygen atoms are isobars

Answers (1)

Answer: C

Isotopes are atoms of the same element (with same atomic number) with different mass numbers. The difference in mass number is because of the different number of neutrons present in the atoms. The two O-atoms in \text {CH}_{3}\text {COOC}_{2}\text {H}_{5} can have different number of neutrons only if the two O-atoms are isotopes.

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