____________ is anything that has mass and takes up space.

• matter
• compound
• particle
• subatomic

All mater is composed of __________.

• compounds
• atoms
• water
• H2O

_____________ are the smallest unit of matter that retains the identity of the substance.

• compounds
• atoms
• water
• H2O

All atoms have a ___________ in the center.

• electron
• cloud
• nucleus
• particle

The nucleus of the atom has  the 
___________ and ___________ in it.

• protons and neutrons
• electrons and neutrons
• protons and electrons

A proton has a ___________ charge.

• positive
• negative
• neutral

The electrons are in the electron _________.

• region
• area
• cloud

An electron has a ___________ charge.

• positive
• negative
• neutral

Protons, neutrons, and electrons are called ____________ particles.

• atomic
• subatomic
• nucleus

What so the blue circles represent?

• protons
• neutrons
• electrons
• nucleus