atom

smallest part of an element that can be identified as that element

electron

negatively charged particle

neutron

neutral particle

nucleus

center, or core, of an atom

proton

positively charged particle

atomic number

number of protons in the nucleus of an atom

atomic mass

total mass of the protons and neutrons in an atom, measured in atomic mass units

mass number

number of protons and neutrons in the nucleus of an atom

energy level

place in an atom where an electron is most likely to be found

compound

substance made up of two or more elements chemically combined

molecule

smallest part of a substance that has all the properties of the substance

substance

any element or compound

mixture

two or more substances that have been mixed together but not chemically combined

chemical formula

way of writing the name of a compound using chemical symbols

subscript

number written to the lower right of a chemical symbol

K shell

can hold up to 2 electrons

L shell

can hold up to 8 electrons

M shell

can hold up to 18 electrons

displacement

amount of water an object replaces

suspension

cloudy mixture of two or more substances that settle on standings

insoluble

not able to dissolve

soluble

able to dissolve

solute

substance that is dissolved in a solvent

solvent

substance in which a solute dissolves

dissolve

go into solution

solution

mixture in which one substance is evenly mixed with another substance

surface tension

like an elastic net around the water that holds the molecules together

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