The smallest building block of all matter in the universe.

Positively charged atomic particles

Uncharged atomic particles

Negatively charged atomic particles that orbit the nucleus

A pure substance, composed of only one type of atom.

Is this an example of an element or a compound?

Is this an example of an element or a compound?

A substance made of only one type of atom that cannot be broken down by chemical means

Substance made of atoms of different elements that are bonded together in a particular ratio

What chart is used to organize the elements by atomic number?