Question

which locations are likely to have subatomic particles with the least mass?
1 and 4
1 and 2
2 and 3
3 and 4

Explanation:

Step1: Recall sub - atomic particles

Sub - atomic particles include protons, neutrons in the nucleus and electrons outside the nucleus. Electrons have the least mass.

Step2: Identify electron location

Electrons are located in the electron - cloud outside the nucleus. In the given diagram, locations 1 and 4 represent the electron - cloud area.

Answer:

1 and 4