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Unit B-2 Vocabulary

Vocabulary words from unit B-2.

TermDefinition
state of matter Distinct forms that matter can take on. These states are solid, liquid, and gas.
solid One of the three states of matter. Matter in this state has tightly-compressed molecules that retain its shape.
liquid One of the three states of matter. Matter in this state has loosely-compacted molecules that can spread out and take the shape of its container.
gas One of the three states of matter. Matter in this state has very loose molecules that repell each other, hence allowing them to spread out through the air and atmosphere.
atom The smallest component of matter; therefore, everything is made up of them.
proton A component of the atom. It releases positive electrical charges.
neutron A component of the atom. It releases no electrical charges.
electron A component of the atom. It releases negative electrical charges.
nucleus The centre of the atom.
electron cloud [INFORMAL PHYSICS TERM] A term used to describe the path that electrons take when they go around the nucleus of an atom.
valence electron Electrons that can participate in the formation of a chemical bond. In a single covalent bond, both atoms in the bond contribute one _____ in order to form a shared pair.
Periodic Table of Elements A table that lists each of the known elements, both natural and manufactured.
reactivity The way that a substance responds to a chemical or other substance.
atomic number The total number of protons in the nucleus.
mass number The total number of protons and neutrons in an atomic nucleus.
atomic mass The mass of an atomic particle, sub-atomic particle, or molecule.
element A substance made up of atoms which all have the same number of protons, or the same atomic number. They are chemically the simplest substances and hence cannot be broken down using chemical methods.
Created by: lclark01