Question

1. how many neutrons does an atom of the isotope copper - 65 have?

Explanation:

Step1: Identify key values

Copper has an atomic number (proton count) of 29. Copper-65 has a mass number of 65.

Step2: Calculate neutron count

Neutrons = Mass number - Atomic number
$\text{Number of neutrons} = 65 - 29$

Answer:

36