Unit 2 Review

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

True or False: The majority of an atom is made up of empty space

• True
• False

The word "atom" comes from a Greek word that means

• Invisible
• Indivisible
• Undivided

Electrons can be found in

• The protons
• The nucleus
• Electron Clouds

All matter is made of _________.

• energy 
• atoms 
• electrons 
• compounds 

The positively charged particles of an atom are the ________.

• electrons
• protons
• neutrons
• protons & neutrons

Which is an electron?

• A
• B
• C

The nucleus of an atom can be described as:

• spacious and negatively charged
• dense and positively charged
• spacious and positively charged
• dense and negatively charged

Value representing the number of protons in an element

• Atomic Mass
• Mass Number
• Valence Electrons
• Atomic Number

Subatomic particles that are neutral in charge

• Neutrons
• Protons
• Nucleus 
• Electrons