Counting Atoms

Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)

• H₃SO₄
• HSO₄
• H₄S₃O
• H₂O

Number of C's in 2Na₂CO₃

• 1
• 2
• 3
• 5

The number of Na's in Na₂CO₃

• 1
• 2
• 3
• 6

How many total atoms are in the compound C₂H₈O ?

• 11
• 2
• 8
• 1

How many Aluminum are in Al₂O₃?

• 3
• 2
• 5

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6

How many Chlorine are in MgCl₂?

• 2
• 1
• 3

How many Magnesium are in 10MgCl₂?

• 10
• 5
• 20

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

a capital letter or combination of a capital letter and a small letter that is used to represent an element is called a(n) ________

• chemical symbol
• element sign