The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

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

• negatrons 
• electrons 
• neutrons 
• protons 

If an atom has 3 electrons, how many protons does it have?

• 1
• 2
• 4
• 3

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

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

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion

The first energy level can hold up to how many electrons?

• 8
• 4
• 2
• 5

What is the atomic mass of "F"

• 9
• 18
• 17
• 19

The particles that are found in the nucleus of an atom are

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