Atoms Physical Science Review

What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common?

• They were all cool dudes.
• They each identified new isotopes of atoms.
• They each contributed to the development of the atomic theory.
• They each designed a new building.

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 

True or False? Neutrons have a negative charge

• True
• False

Element or compound?
O₂

• Element
• Compound

 What is at the center of every atom? 

• nucleus
• neutron
• proton
• all of these 

 An atom is neutral if...    

• The number of protons = electrons
• The number of neutrons = protons
• The number of protons∠ electrons
•  Electrons+Neutrons = 0

The smallest common particle in the atom...   

• electron
• proton
• nucleus 
• neutron

Neutrons are important because...      

• They hold the nucleus together
• They have a positive charge
•  They orbit outside of the atom
• All of these