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Overall Chemistry Vocabulary; Key Points


simplest pure substance


the basic building blocks of all matter.

Atoms (made of)

made of protons, neutrons, and electrons.


POSITIVELY charged and inside the nucleus


NEUTRAL particles inside the nucleus


NEGATIVELY charged particles OUTSIDE the nucleus

Atomic Number

determines an elements identity and the number of protons and electrons in an atom.

Atomic Mass

protons + neutrons


Atomic #= # of protons= # of electrons


Mass-Atomic#=#of neutrons

Alkali Metals

Extremely reactive, containing one valence electron, and is never found in their pure form.

Alkaline-Earth Metals

Slightly less reactive than Alkali Metals, and have 2 valence electrons.

Transition Metals

Shiny, less reactive, and good conductors

Lanthanides and Actinides.

Transition metals that are reactive


Shiny & reactive


Radio active


tells the number of electron shells


# of valence electrons


very reactive non metals that are poor conductors and tend to go with Alkali metals

Noble Gases

non reactive non metals


Atoms of elements that have the same number of protons but a different number of neutrons inside the nucleus


Charged particles that form during chemical changes. They form when one or more valence electron is transferred.


tiny numbers to the bottom right of an element's symbol


a number placed in front of a molecular formal to indicate how many molecules/atoms take part in the reaction.

Chemical reaction

Chemical changes

Chemical change

Tigers Pounce on colored Geckos

Law of Conservation of mass

in a chemical change, the mass of reactants at the start is equal to the mass of the products


any substance that is used up during a reaction


any substance that is produced during a reaction

Physical Properties

easily observed w/o tempering with the product

Chemical Properties

only observed during chemical reactions. ex) is it combustable?

Physical changes

occur when substances are changed to another phase, are separated or combined. No new substance is produced

Phase Changes

ex) Melting=solid>liquid

chemical changes

occur when a new chemical substance is produced after a reaction

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