periodic table Flashcards

1
Q

groups

A

column going down, 18 groups on periodic table

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2
Q

periods

A

rows going across, 7 periods in periodic table

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3
Q

trends down a group

A

the number of outer shell electrons is the same, the number of complete electron shells increases by one

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4
Q

trends across a period

A

the number of shells electrons increases by one, the number of complete electron shells stays the same

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5
Q

groups 1

A

alkali metals, very reactive, rarely found in nature

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6
Q

group 18

A

noble gases

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7
Q

group 2-13

A

transition metals, typical metals, high melting and boiling points

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8
Q

group 17

A

halogens, very reactive non-metal, toxic and harmful

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