Chapter 4 Flashcards

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1
Q

Atoms

A

Democritus

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2
Q

Electrons

A

Thomson

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3
Q

Nucleus

A

Rutherford

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4
Q

Modern Atomic Theory

A

Bohr

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5
Q

the smallest unit of an element that maintains the properties of that element

A

Atom

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6
Q

a subatomic particle that has a negative charge

A

Electron

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7
Q

in physical science, an atom’s central region, which is made up of protons and neutrons

A

Nucleus

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8
Q

A region around the nucleus of an atom where electrons are likely to be found.

A

Electron Cloud

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9
Q

a subatomic particle that has a positive charge and that is found in the center of the nucleus of an atom.

A

Proton

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10
Q

A unit of mass that describes the mass of an atom or molecule

A

Atomic Mass Unit

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11
Q

A subatomic particle that has no charge and that is found in the nucleus of an atom.

A

Neutron

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12
Q

the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of the same element.

A

Atomic Number

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13
Q

an atom that has the same number of protons(or the same atomic number) as other atoms of the same element do but that has a different number of neutrons(and thus a different atomic mass.

A

Isotope

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14
Q

the sum of the number of protons and neutrons in the nucleus of an atom

A

Mass number

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15
Q

Atomic Theory

A

Dalton

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