Atoms

All matter is made of what

• energy

• atoms

• electrons

• compound

What is the center of the atom called

• an electron

• a compound

• a molecule

• a nucleus

The atomic mass is the

• number of protons and neutrons inside the nucleus

• number or electrons or protons

• number of protons, neutrons and electrons

All matter is made of _________.

• energy 
• atoms 
• electrons 
• compounds 

How many atoms are in He

Answer explanation

2

The positively charged particle in an atom.

• Proton

• Neutron

• Electron

• Nucleus

The unit used to express the mass of the particles in an atom.

• Proton

• AMU

• Neutron

• Electron

The negatively charged particles in an atom

• Proton

• Electron

• Neutron

• Electron Cloud

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

• Proton

• Atom

• Electron Cloud

• Neutron

The particles in the nucleus of an atom that do not have a charge (neutral)

• Proton

• Electron

• Neutron

• Ion