The nucleus contains _______ & ______.

Neutrons have ___________ charge.

Buzzing around the outside of the nucleus are very small particles called _______. (Electrons have a _______ charge.)

Everything is made of atoms, everything that you touch and feel is mostly ________ ________.

_______ are like letters and molecules are like _________.

What makes 1 atom different from another? The number of ___________ in the ____________.

The _______ _______ is the number of protons in the nucleus.

There are _______ elements that occur naturally.

Everything in the universe is either _________ or _________.

Everything that's a thing is ___________.

Atoms are the smallest pieces of "stuff" that's still _______________.

__________ makes the chemicals of living things. It's the key to life.

Carbon is so important, that there is a whole branch of chemistry named after it called _____ chemistry.