Atoms Review

What is at the center of an atom?

An atom's nucleus contains both ___ and ___

• Electrons

• Neutrons

• Protons

The cloud surrounding the nucleus of an atom contains moving ___

An element is made up of atoms of all the same type, true or false?

An ___ is a substance that cannot be broken down to a simpler substance.

The number of ___ in the nucleus tells us what type of element an atom is.

How many protons does Bismuth have?

What is Bismuth's atomic number?

Atoms always have the same number of protons and neutrons

• True

• False

Found that electrons (-) move in circular orbits and between energy levels around the nucleus

• Democritus

• Bohr

• Rutherford

• Chadwick