What are the most common elements in the oceans?

Pure substance made of one kind of atom and CANNOT be broken down is

What holds compounds together?

Pure substance made up of two or more kinds of elements that have been chemically joined.

Smallest part of a compound is a

Atom is to element as molecule is to

What are the most common elements in the Earth's crust?

A combination of chemical symbols used to represent a compound

Only ______________ are found on the periodic table.

The most common elements in the atmosphere are

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