Atomic Structure + Periodic Table Vocab Flashcards

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1
Q

Atom

A

Smallest unit of matter that has the properties of an element

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2
Q

Proton

A

Positively charged subatemic particles in the nucleus (+1)

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3
Q

Nutron

A

Neutral subatomic particles in the nucleus (0)

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4
Q

Electron

A

Negatively charged subatomic particle outside the nucleus (-1)

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5
Q

Nucleus

A

Center of an atom ; has protons and 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 elections

A

electrons in the outermost energy shell; they determine reactivity

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