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Lesson 4.2 A.Models

Lesson 4.2 Atomic Models and Subatomic particles

TermDefinition
atoms Building blocks of matter. The smallest particles of an element that still have the element's properties
proton A subatomic particle that has a positive charge and that is found in the nucleus of an atom
Electron The smallest subatomic particle, that has a negative charge and is location outside of the nucleus
Neutron A subatomic particle that has no charge and that is found in the nucleus of an atom
neutral No charge (=0)
nucleus Dense center of an atom
scientific model physical, conceptual, or mathematical representation of a real phenomenon whose purpose is to explain and predict the observed phenomenon.
John Dalton's Atomic Theory 1) all matter is composed of atoms 2) all atoms of the same atom are identical 3) when compounds from, atoms combine in simple whole number ratios4) atoms are either rearranged or combined 5) atoms cannot be divided, created or destroyed
atomic model Model that shows the structure of an atom and the arrangement of subatomic particles in an atom.
Plum Pudding Model J.J Thomson's model of an atom, in which he thought electrons were randomly distributed within a positively charged cloud
Gold Foil Experiment experiment by Ernest Rutherford that shot alpha particles at a gold foil. The results were used to discover the nucleus and that atoms were mostly empty space.
Nuclear Model Model of the atom with a nucleus containing protons and neutrons and with electrons in the space outside the nucleus
alpha particles positively charged particles with about four times the mass of a hydrogen atom
Plum Pudding Model J.J Thomson's model of an atom, in which he thought electrons were randomly distributed within a positively charged cloud
Gold Foil Experiment experiment by Ernest Rutherford that shot alpha particles at a gold foil. The results were used to discover the nucleus and that atoms were mostly empty space.
Nuclear Model Model of the atom with a nucleus containing protons and neutrons and with electrons in the space outside the nucleus
Created by: Sara_Kellogg21
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