Question

multiple - choice question what is the mass of this atom? what is the mass of this atom? protons neutrons electrons 1 4 3 2 rewatch

Explanation:

Step1: Recall atomic mass concept

Atomic mass is mainly determined by protons and neutrons as electrons have negligible mass.

Step2: Count protons and neutrons

There are 2 protons and 1 neutron in the nucleus.

Step3: Calculate atomic mass

Atomic mass = number of protons + number of neutrons = 2 + 1=3

Answer:

3