A ______________ is a PURE SUBSTANCE that contains only one kind of atom.

Elements are arranged on the __________ _________ based on their properties.

Each element is represented by a one or two-letter abbreviation called a ____________ symbol

A __________ is a substance that is made when two or more elements combine.

A molecule of water contains two atoms of _________ and one atom of _______

Ca is the chemical symbol for which element?

The element that is represented by he chemical symbol Si

The chemical symbol for sodium is

The chemical symbol for iron is

The chemical formula for water is H2O, is H20 an element or compound

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