Question

a model of a helium (he) atom is shown below.
which numbered part of the helium atom represents a proton?
a 2
b 3
c 4
d 1

Explanation:

In an atom model, protons are located in the nucleus. In a typical atom diagram, different parts have different identities:

• Part 1 usually represents the electron cloud (where electrons are).
• Part 2 represents a neutron (neutral - charged particle in the nucleus).
• Part 3 represents a proton (positively - charged particle in the nucleus).
• Part 4 might be another sub - atomic particle or a label for the nucleus region in a simple diagram.

Answer:

B. 3