Properties of isotopes, isobars and isotones — task. Chemistry CBSE Live product, Class 9 (2026-27).

Choose the correct answer given below:

1. Which one of the following is true about isotones?

They have the same chemical properties
They have the same number of neutrons but different atomic numbers
They have the same number of protons but different neutrons
They have the same mass number but different atomic numbers

2. Which isotope is used to treat thyroid disorders like goitre?

Sodium-\(24\)
Iodine-\(131\)
Carbon-\(14\)
Cobalt-\(60\)

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