Atoms

all matter is made of what 

• energy 

• atoms 

• electrons 

• compounds 

The positive particles of an atom are 

• electrons 

• positrons 

• neutrons 

• protons 

the central region of an atom where its neutrons and protons are is its 

• nucleus 

• electron cloud

• core 

• center 

Particles in an atom that are neutral and have no charge are 

• negatrons 

• electrons 

• neutrons 

• protons 

A particle that moves around the nucleus is a(n)...

• Proton

• Neutron

• Electron

• Quark

The subatomic particle with a negative charge is the

• electron

• proton

• neutron

• nucleus 

What is the atomic number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

What is the mass number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons