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Chp 11 Vocab
25
Science
8th Grade
10/05/2011

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Term
Atom
Definition
the smallest particle into which an element can be divided and still be the same substance
Term
Electrons
Definition
negatively charged particles that Thomson discovered
Term
Nucleus
Definition
in the center of the atom is a tiny, extremely dense, positively charged part
Term
Electron Clouds
Definition
regions inside the atom where electrons are likely to be found
Term
Protons
Definition
positively charged particles in the nucleus
Term
Atomic Mass Unit
Definition
The SI unit used to express the masses of particles in atoms
Term
Neutrons
Definition
particles of the nucleus that have no electrical charge
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom
Term
Isotopes
Definition
atoms that have the same number of protons but have different numbers of neutrons
Term
Mass Number
Definition
the sum of the protons and neutrons in an atom.
Term
Atomic Mass
Definition
The weighted average of the masses of all the naturally occurring isotopes of that element
Term
Gravitational force
Definition
Pulls objects toward each other.
Term
Electromagnetic Force
Definition
Causes objects with the same charges to repel from each other, and with different charges they attract.
Term
Strong Force
Definition
Keeps Protons together
Term
Weak Force
Definition
An important force in radioactive atoms, it plays a key role in the change of a proton to a neutron or electron.
Term
Plum Pudding Model.
Definition
Thomson thought that electrons were mixed throughout an atom, like plums in a pudding
Term
Dalton's Atomic Theory
Definition
All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed.
Atoms of the same element are exactly alike, and atoms of different elements are different.
Atoms join with other atoms to make new substances.
Term
Theory
Definition
A set of ideas meant to describe something based on someone's own suppositions, or experiments.
Term
Bohr's Model
Definition
Bohr made a model of an atom that showed the number of protons,neutrons, and electrons. He is kind of responsible for the electron cloud.
Term
Democritus
Definition
Thought that matter is composed of atoms
Term
Forces in an atom
Definition
Gravitational, Strong, and Weak
Term
Atomos
Definition
A greek word meaning, unable to be divided, indivisible
Term
Model
Definition
A representation of an object or system that is smaller than or bigger than that actual object
Term
Each proton and neutron have____ amu
Definition
1
Term
Protons and Neutrons= what??
Definition
The Atomic Mass
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