Question: Matter

Answer: Anything that has mass and takes up space. Exists in 4 forms: solid, liquid, gas, and plasma.

Question: Elements

Answer: Any substance that cannot be broken down into simpler substances. Each element has unique properties such as density, solubility, melting point, and reactivity. There are 92 naturally occurring elements.

Question: Atoms

Answer: Smallest particle of an element

Question: Atomic Symbol

Answer: A one or two letter abbreviation for an element.

Example: H for hydrogen, O for oxygen. To the right of the Atomic Number and Mass Number.

Question: Protons

Answer: Positively charged subatomic particles found in the nucleus of an atom. Mass= 1 amu

Question: Neutron

Answer: A subatomic particle that has no charge and that is found in the nucleus of an atom. Mass= 1 amu

Question: Electron

Answer: A subatomic particle that has a negative charge and lives in a cloud surrounding the nucleus. Mass= 0 amu

Question: Atomic number

Answer: The number of protons and electrons in the nucleus of an atom. Lower left corner.

Question: Mass Number

Answer: The total number of protons and neutrons in a nucleus. Upper left corner.

Question: Isotopes

Answer: Atoms with the same number of protons but different numbers of neutrons.