atoms Flashcards

1
Q

Atom

A

the basic unit of matter.

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2
Q

Atomic number

A

the number of protons in the nucleus of an atom.

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3
Q

Electron

A

– a negatively charged particle that moves around the nucleus.

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4
Q

Electron dot diagram

A

a diagram that shows the element symbol surrounded by dots
representing valence electrons.

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5
Q

Element

A

a pure substance that cannot be broken down into simpler substances by
ordinary chemical means

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6
Q

Energy Level

A

– a particular region where electrons can orbit a nucleus.

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7
Q

Ion

A

an atom or molecule that has an electrical charge because it has gained or lost
electrons.

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8
Q

Isotope

A

one of several forms of the same element

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9
Q

Mass number

A

the number of protons plus neutrons in the nucleus of an atom.

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10
Q

Neutron

A

a particle with no charge located in the nucleus of an atom

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11
Q

Nucleus

A

the positively charged, dense center of an atom.

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12
Q

Periodic table

A

a chart that organizes the chemical elements based on their properties.

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13
Q

Proton

A

a positively charged particle located in the nucleus of an atom

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14
Q

Radioactive

A

capable of releasing radiation

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15
Q

Valence electrons

A

electrons found in the outermost energy level of an atom

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