Atoms and Molecules

Which is smallest

• Atom
• Electron
• Cell
• Molecule

What is the charge of an electron?

• +1
• -1
• 0

When atoms bond to form molecules, they share...

• protons
• neutrons
• electrons
• sandwiches

How many hydrogen atoms are in a water molecule?

• 1
• 2
• 3
• 0

The beginning substances in a chemical reaction are called...

• reactants
• products

C is the chemical symbol for...

• Carbon
• Calcium
• Chlorine
• Californium

He is the chemical symbol for

• Hydrogen
• Helium
• Hexane
• Hufflepuff

Hydrogen usually has one proton, but sometimes it has two. 

• True
• False

Which of the following is NOT a physical property?

• iron can oxidize into rust
• water freezes at 32 degrees F
• Gold is shiny and metallic
• Helium is lighter than Oxygen

Order elements from lowest number of protons to the highest

• O, Ar, H
• H, Ar, O
• H, O, Ar