Question

Hello can somone help me ?

Copper has an atomic number of 29.

That means that there are 29 protons in the nucleus of each copper atom. That's what the atomic number is; the number of protons in an atom of a certain element.

if one copper atom contains 29 protons, how many ELECTIONS are there in in 4 atoms of copper?

Answer 1

There are 116 electrons in four atoms of Cu.

A Cu atom contains 29 protons, so it also contains 29 electrons.

$\text{No. of electrons } = \text{ 4 Cu atoms } \times \frac{\text{29 electrons}}{\text{1 Cu atom }} = \text{ 116 electrons }$