Matter & The Atom.

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Presentation transcript:

Matter & The Atom

Atomic Structure Nucleus Protons Neutrons Electrons

Atomic Structure Electrons Tiny, very light particles Have a negative electrical charge (-) Move around the outside of the nucleus

Atomic Structure Protons Much larger and heavier than electrons Protons have a positive charge (+) Located in the nucleus of the atom

Atomic Structure Neutrons Large and heavy like protons Neutrons have no electrical charge Located in the nucleus of the atom

Atomic Structure

Describing Atoms Atomic Number = number of protons In a neutral atom, the # of protons = the # of electrons

Describing Atoms Atomic Mass Number - equal to the number of protons plus neutrons.

Isotopes The number of protons for a given atom never changes. The number of neutrons can change. Two atoms with different numbers of neutrons are called isotopes

Isotopes Have the same atomic number (number of protons) Have different atomic mass numbers (number of protons + neutrons)

Isotopes