Periodic Table Flashcards

0
Q

Alkali metal

A

Highly reactive elements that are shiny, soft and silvery

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1
Q

Actinide

A

Fifteen metallic elements with the atomic numbers 89-103

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2
Q

Alkaline earth metal

A

Moderately reactive natural elements; Shiny and silvery white

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3
Q

Atomic number

A

Number of protons in the nucleus of an atom

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4
Q

Halogen

A

Series of very reactive nonmetals

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5
Q

Isotope

A

Variant of a chemical element; protons are the same but neutrons vary

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6
Q

Lanthanide

A

15 metallic elements with atomic numbers 57-71

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7
Q

Metalloid

A

Mix between metals and nonmetals

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8
Q

Noble gas

A

Six odorless, colorless gases with low reactivity

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9
Q

Nonmetal

A

Group of elements that are poor conductors of heat and electricity; dull and brittle

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10
Q

Post transition metal

A

Metals to the right of transition elements in the periodic table

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11
Q

Rare earth elements

A

17 elements; lanthanides plus scandium and yttrium

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12
Q

Transition metal

A

Familiar metals such as iron, nickel, copper and gold

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