Question

what changes when you add a neutron to an atom?
○ its mass increases by 1.
○ its mass decreases by 1.
○ its net charge changes to -1.
○ its net charge changes to +1.

Explanation:

Neutrons have a mass of approximately 1 atomic mass unit and no electric charge. Adding a neutron to an atom increases its mass by 1 atomic mass unit and does not change its net - charge since neutrons are neutral.

Answer:

Its mass increases by 1.