Counting Atoms Grade 6

Counting atoms in a chemical formula

​Elements bond together to make molecules

Each molecule has a specific ratio. That combination of specific numbers of elements is called a chemical formula.

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The subscript tells you how many of each element there is. If there is no subscript, there is only one of that element.

​subscripts

Each capital letter is a different element.

​Atomic Symbol

Formulas have two parts

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The letter H is the atomic symbol for hydrogen. The letter O is the atomic symbol for oxygen. ​There is a 2 for the subscript of hydrogen and oxygen doesn't have a subscript. So how many atoms and elements are in water?

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​Let's try some...

Multiple Choice

How many elements are in water?

• 1

• 2

• 3

• 4

Multiple Choice

How many atoms are in water?

• 1

• 2

• 3

• 4

Multiple Choice

How many elements are in a molecule of glucose?

• 3

• 6

• 12

• 18

Multiple Choice

How many atoms of carbon are in glucose?

• 3

• 6

• 12

• 18

Multiple Choice

How many atoms of hydrogen are in glucose?

• 3

• 6

• 12

• 18

Multiple Choice

How many total atoms are in one molecule of glucose?

• 3

• 6

• 12

• 24

Open Ended

The chemical formula for an antacid is CaC0_3.

_{How many elements are in the formula for antacids?}

Open Ended

The chemical formula for an antacid is CaC0_3.

_{How many total atoms are in the formula for antacids?}