CHEMICAL FORMULA
PERIODIC TABLE
100

This two-part chemical formula is the most common compound on Earth, and it's essential for all known forms of life.

what is H2O

100

This element, represented by the symbol "H", is the lightest and most abundant element in the universe

What is hydrogen?

200

How many atoms are in one molecule of water (H₂O)?

what is two hydrogen atoms (H) and one oxygen atom (O)

200

This element, known for its ability to conduct electricity and be stretched into wires, has the symbol "Cu".

What is copper?

300

This is the chemical formula for ordinary table salt

What is NaCl?

300

 This group of highly reactive nonmetals, including fluorine and chlorine, is known for forming salts.

 What are the halogens?

400

 Used by plants for photosynthesis, this chemical has a formula that combines one atom of carbon with two atoms of oxygen

What is carbon dioxide?

400

Each horizontal row on the periodic table is known by this term.

What is a period?

500

This common household substance, used in baking and as an odor absorbent, has the chemical formula.

baking soda?