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smallest particle of an element that can exist and still have the properties of the element

Atomic theory of matter

1) All mater is made up of small particles called atoms

2)All atoms of any given typer ar similar to one another and significantly different from all other types

3) The relative number and arrangement of different atoms in a pure substrance determine its identity.

4)Chemical change is a union separtaion, or rearrangement of atoms to give new substances

5) Only whole atoms can participate in or result from any chemical change, since atoms are considered indestructible during such changes


two or more atoms tightly bound together that function as a unit

Diatomic molecule

Molecule that contains two atoms


Molecule that contains three atoms


Molecule that contains four atoms


Molecule in which all atoms present are the same kind


Molecule in which two or more different kinds of atoms are present

Chemical Formula

a notation made up of the chemical symbols of the elements present in a compund and numerical subscript(located to the right of each chemical symbol) that indicate the number of atoms of each element present in a structural unit of the compound

Ionic Compounds

compounds that contain ions
no molecules

Subatomic particle

a very small particle that is a building block for atoms
ie proton, neutron, or, electron


subatomic particle with a negative charge


subatomic particle with a postive charge


subatomic particle with a neutral charge


small, dense, positively charged center of an atom


subatomic particle found in th nucleus of an atom

Atomic number

number of protons in the nucleus of an atom


pure substance in which all atoms present have the same atomic number(sam number of protons)

mass number

sum of the neutron and protons in the nucleus


atom with same number of protons and electrons but different number of neutrons

Percent abundance

percent of atoms in a natral sample of a pure element that are a particular isotope of the element


atoms that have the same mass number but different atomic number

Atomic mass

relative mass of an average atom of an element on a scale using carbon 12/6Catom as the reference.
Unit is AMU

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