Atomic Structure + Periodic Table Vocab Flashcards

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1
Q

Atom

A

Smallest unit of matter that has properties of an element

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2
Q

Protons

A

Positivity charged subatomic particles in (1+) the nucleus

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3
Q

Neutron

A

Neutron subatomic particle in the nucleus (0)

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4
Q

Electrons

A

Negatively charged subatomic particles outside the nucleus (-1)

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5
Q

Nucleus

A

Center of an atom, has protons + neutrons

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6
Q

Atomic number

A

Number of protons , identifies an atom

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7
Q

Mass number

A

Number of protons + number of neutrons

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8
Q

Group

A

Column on the periodic table, has the same number of valence electrons

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9
Q

Period

A

Row on the periodic table

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10
Q

Valence Electron

A

Electrons in the outermost energy shell. They determine reactivity.

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