NEET Physics: Atomic Structure questions with solutions

Q1. Which of the following is an isotope of hydrogen?

1. Deuterium
2. Trinium
3. Promium
4. All of the above

Answer: Deuterium

Deuterium is an isotope of hydrogen because it has one proton like hydrogen but one neutron, making it heavier than ordinary hydrogen. The other names are not standard hydrogen isotopes.

Q2. An atom which has a mass number of 14 and has 8 neutrons is an:

1. isotope of oxygen
2. isobar of oxygen
3. isotopes of carbon
4. isobar of carbon

Answer: isotopes of carbon

Mass number 14 with 8 neutrons means the atom has 6 protons, so it is carbon. Since it is a carbon atom with a different mass number than the common form, it is an isotope of carbon.