How many elements occur in nature?

The connection between atoms in more complex particles is called a:

A group of two or more atoms that are held together by chemical bonds

A unique molecule always has a unique composition and structure.

The types of elements that make up a substance, as well as the specific ratios of atoms of each kind of element that make it up

How many hydrogen atoms are in a water molecule?

How many oxygen atoms are in a water molecule?

What is the difference between a water molecule and a hydrogen peroxide molecule?

Describe why the number of atoms are the same, but the they are different molecules.

__________ is a solid structure whose atoms or molecules are arranged in repeating, three-dimensional subunits.