Question

multiple - choice question what is this atoms mass, and why? protons neutrons electrons 1, because it has one proton 4, because it has four subatomic particles 2, because it has two electrons 2, because it has one proton and one neutron 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

From the image, there is 1 proton (purple) and 1 neutron (blue).

Step3: Calculate atomic mass

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

Answer:

2, because it has one proton and one neutron