These particles are positively charged.

Electrons are negatively charged particles found ______.

An atom with a _________ charge will have an equal number of protons and electrons.

Electrons contribute significantly to the mass of an atom.

An atom with 8 protons and 10 neutrons has an atomic number of _____.

In order for an atom to become a different element its ______ must change.

A substance that cannot be broken down into a simpler substance is a(n) _________.

The number of protons plus neutrons is referred to as the _________.

_______ are atoms with the same number of protons but varying numbers of neutrons.

Some isotopes are more common within an element. This amount is referred to as its _______.

Protons and neutrons are composed of up and down _____.

A half-life is the amount of time it takes ______ of a radioactive substance to decay.

The splitting of an atoms nucleus is called ____.

Carbon-12, carbon-13, and carbon-14 are examples of _____.

when there are too many _____ in a nucleus, it is unstable and can decay.

Radioactive decay occurs because the _____ in the nucleus are out of balance or in opposition.

If an atom has an atomic number of 22 then it has ____ protons in the nucleus.