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Question

Two isotopes of chlorine are present in nature: chlorine-35 and chlorine-37. Which statement best explains their chemical behavior?

This question was previously asked in
RRB Group D 2025 Question Paper (9-Aug-2026) (Shift 1)
The correct answer is

They form identical compounds

Isotopes are atoms of the same element with the same atomic number but different mass numbers. Chlorine-35 and chlorine-37 both have 17 protons and 17 electrons; they differ only in the number of neutrons (18 and 20).

Chemical properties depend on the number and arrangement of electrons. Both isotopes have the electronic configuration 2, 8, 7 and valency 1, so they behave alike chemically.

Both form HCl with hydrogen and NaCl with sodium in the same way.

Hence, the answer is They form identical compounds.

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