When atoms combine to form molecules, they have formed a __________ between them. 

Molecules form when atoms gain or lose ________

Valence electrons are transferred

Valence electrons are shared

What are the elements in group 18 (the far right) of the periodic table called?

________ molecules are found in nature as single atom elements

Which of the following can exist in monatomic form?

______ molecules are found in nature as pairs of two atoms of the same type covalently bonded together.

Which of the following types of elements can exist in nature as diatomic molecules?

What is an element?

What is a molecule?

What is a compound?

This is any combination of two or more atoms from different elements that are chemically combined.

Any combination of two or more atoms that are chemically combined is called this.

This is what holds atoms in a molecule and compound together. They can be ionic, covalent, or metallic (and you'll learn about these in high school chemistry).

This is the written out expression for a substance and contains each element in it and the number of atoms for that element.

This is something that contains that substance and nothing else.

This is a one or two letter representation of each element that is generally close to the element's name. The first letter of this will ALWAYS be capitalized.