Periodiska systemet Flashcards

1
Q

atomnummer

A

antal protoner i atomkärnan

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2
Q

masstal

A

antal protoner och neutroner i atomkärnan

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3
Q

valenselektroner

A

antal elektroner i yttersta skalet

deltar i kemiska reaktioner

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4
Q

grupper

A

gruppnumret talar om antalet valenselektroner

lodrätt

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5
Q

perioder

A

periodnumret talar om antal elektronskal

vågrätt

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6
Q

isotoper

A

en variant av ett grundämne

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7
Q

metaller

A

leder elektricitet och värme
har metallglans
bildar positiva joner

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8
Q

icke-metaller

A

bildar negativa joner

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9
Q

halvmetaller

A

extremt viktiga inom elektronik, t.ex. i chip

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10
Q

metall som är flytande i rumstemperatur

A

kvicksilver

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11
Q

icke-metall som är flytande i rumstemperatur

A

brom

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12
Q

alkalimetaller

A

grupp 1

starkt reaktiva

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13
Q

halogener

A

grupp 7
7 valenselektroner
väldigt reaktiva

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14
Q

ädelgaser

A

grupp 8

nöjda

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15
Q

varför reagerar ämnen överhuvudtaget med varandra

A

strävar efter att uppnå ädelgasstruktur

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16
Q

jon

A

antalet elektroner är inte samma som antal protoner

elektroniskt laddad