4 Introduction to Atoms Flashcards

1
Q

Atom

A

The smallest unit of an element that maintains the properties of that elements.

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2
Q

Electrons

A

A subatomic particles that has a negative charge.

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3
Q

Nucleus

A

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

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4
Q

Electron Clouds

A

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

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5
Q

Protons

A

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

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6
Q

Atomic mass unit

A

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

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7
Q

Neutrons

A

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

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8
Q

Atomic Number

A

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

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9
Q

Isotopes

A

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)

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10
Q

Mass number

A

The sum of the numbers of protons and neutrons in the nucleus of an atom.

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11
Q

Atomic mass

A

The mass of an atom expressed in atomic mass unit

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