Question

6 an atom or compound that does not contain equal numbers of protons and electrons, and therefore has a net charge
7 a chemical bond that forms between ions of opposite charges; electrons are transferred between two atoms
8 one or more forms of an element that have different numbers of neutrons
9 the number of protons plus neutrons in an atom

Explanation:

1. An ion is an atom or compound with unequal protons and electrons, resulting in a net charge.
2. An ionic bond is formed between ions of opposite charges by electron - transfer.
3. Isotopes are different forms of an element with varying neutron numbers.
4. The mass number of an atom is the sum of protons and neutrons.

Answer:

1. Ion
2. Ionic bond
3. Isotope
4. Mass number