ATOMS AND MOLECULES

which one only has one type of atom In it.

• Element
• compound

Which of the following represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

Which of the following is not a compound?

• HCl
• Cl
• NaCl
• CO2

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 

What are the 3 particles that make-up the atom?

• protons, neutrons, and isotopes
• neutrons, isotopes, and electrons
• positives, negatives, and electrons
• protons, neutrons, and electrons

How many Magnesium are in 10MgCl₂?

• 10
• 5
• 20

Which part of the atom has a negative charge?

• proton

• electron

• neutron

the number of protons equals the number of

• electrons

• protons

• neutrons

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18