Question

Study the data given below and answer the questions which follow:

In a sample of ethyl ethanoate (CH₃COOC₂H₅), the two oxygen atoms have identical numbers of electrons but differing numbers of neutrons. Which of the following provides the correct explanation for this?

Isotopes and isobars are two important concepts in nuclear chemistry that help us understand the behaviour of elements. Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. For example, carbon-12 and carbon-14 are isotopes of carbon, with six protons but different neutron counts. In contrast, isobars are atoms of different elements that have the same mass number but different atomic numbers, meaning they contain different numbers of protons and neutrons. An example of isobars includes argon-40 and calcium-40, both having a mass number of 40 but differing in their elemental identity. Understanding isotopes and isobars is crucial in fields such as radiocarbon dating, nuclear medicine, and understanding the stability of atomic nuclei.

Distinguish between isotopes and isobars.

Two nuclei have different mass numbers A₁ and A₂. Are these nuclei necessarily the isotopes of the same element ? Explain.