Question

How many electrons are there in the atom with a mass number of 66 and n = 35?

Answer 1

31

Step-by-step explanation:

Given parameters:

Mass number = 66

Number of electrons = 35

Unknown:

Number of electrons

Solution:

In an atom, the number of protons and electrons are the same. In ions, there is a difference between the two numbers.

For this problem, once we can find the number of protons, it is therefore the number of electrons.

Mass number = number of protons + number of neutrons

Insert the parameters and solve;

66 = number of protons + 35

Number of protons = 66 - 35 = 31

So the number of electrons is 31