The region inside an atom where electrons are likely to be found

What two subatomic particles have approximately the same mass?

The neutrally charged particle (no charge) inside the nucleus is called a(n)

The smallest unit of an element that maintains the properties of that element

A particle smaller than an atom

Anything that has mass and takes up space

A subatomic particle that has a positive charge and that is located in the nucleus of an atom.

A subatomic particle that has neutral (neither positive nor negative) charge and is located in the nucleus

A subatomic particle that has negative charge and is located outside of the nucleus

Space outside of nucleus where electrons are likely to be found

The number of protons in the nucleus of an atom

What vocabulary word completes the missing box in the table?