Select all the correct answers. Why do the atoms in a piece of copper metal have no net charge?

1.The charges of the positive and negative copper ions cancel each other out.

2.The number of electrons surrounding each copper nucleus doesn’t change.

3.Copper atoms can’t lose electrons without a substance present to gain electrons.

4.When a copper atom loses electrons, it also loses a corresponding number of protons.

5.The copper atoms exchange neutrons instead of electrons.

The correct answer is the charges of the positive and negative copper ions cancel each other out.

Explanation:

A copper metal having no net charge means that it is a neutral atom. A neutral atom means that total number of protons is equal to the total number of electrons.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

the answer is true. hope it .