Q. Isotopes have:

1. similar physical quantities and different chemical properties
2. different physical properties
3. similar chemical properties

Which of the above is / are correct?
Answer: Only 2 and 3
Notes: Isotopes are the atoms of an element with the same atomic number but different mass number. They have similar chemical properties because valency and number of valence electrons are the same. They differ in physical properties because they have different numbers of neutrons, which affects the mass number. Mass number determines the physical properties such as boiling/melting/density etc.

This question is part of UPSC Daily 20 MCQ Series Course on GKToday Android app.