Each chemical element has a unique. The sum of the number of protons and neutrons in an atom is called the. The number of protons in an atom is called the atom's. An atom with more electrons than protons has a negative. Most hydrogen atoms have only a single proton in their nucleus, so a hydrogen atom that also has one neutron is an of hydrogen.

Atomic mass, atomic number, charge, isotope

Explanation:

Protons and neutrons have mass.

Protons are the atom's identity.

Electrons are negative so when there is one more, the charge of the atom becomes negative.

As long as the number of protons stay the same, the element is the same. The more neutrons there are changes the atom into a isotope of said element.

1. Chemical properties

2. Atomic Mass

3. Atomic Number

4. Negative Charge

5.