Question

Members of which of the following have similar chemical properties?
A. isotope
B. isobars
C. allotropes
D. both isotopes and allotropes

Answer 1

Hint: According to the definition of the terms,Isotopes have a similar atomic number. Isobars have the same mass number. Allotropes are made up of the same element. Chemical properties depend upon the electronic configuration.

Complete Step by step answer: The chemical elements that have a different number of neutrons but the same proton number are known as isotopes.
The isotopes have the same number of protons. Due to the same proton number, all isotopes have the same electronic configuration, so represent the one element. So, the isotopes have similar chemical properties because all isotopes are the same element.
The chemical elements that have a different number of protons but the same mass number are known as isobars.
When a chemical element exists in two or more physical forms are known as allotropes. All allotropes have the same element. So, the proton and neutron numbers are the same. So, the electronic configuration of the elements are the same and hence due to the same electronic configuration allotropes should have similar chemical properties but different physical forms have different electrostatic forces and several different structural properties which make their reactivity different for the same chemical. Hence allotropes also have different chemical properties. Diamond, graphite, and fullerene are allotropes of carbon.
So, the members of isotopes have similar chemical properties.

Therefore option (A) isotopes, is correct.

Note: Proton number represents the atomic number. Due to the same proton number isotopes have the same atomic number but different mass numbers due to different neutron numbers. Isotopes represent one element whereas isobars represent different elements. Allotropes also have different physical properties. Diamond is the hardest allotropes and non-conductivity whereas graphite is the conductor.