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Week 5 Vocabulary
Atoms
10
Science
9th Grade
09/30/2015

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Term
Atom
Definition
Basic unit of matter composed of three subatomic particles
Term
Atomic #
Definition
The number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus
Term
Atomic mass
Definition
#of protons and neutrons in an atom.
Term
Proton
Definition
Positively charged particle located in the nucleus
Term
Electron
Definition
Negatively charged particle located outside the nucleus
Term
Neutron
Definition
Neutrally charged particle located in the nucleus
Term
Shell
Definition
Pathway that the electrons travel
Term
Neils Bohr
Definition
Designed a model that depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits.
Term
Nucleus
Definition
Center of the atom
Term
John Dalton
Definition
Established the Modern Atomic Theory. Showed scientifically that the atom existed.
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