group 7 elements Flashcards

1
Q

fluorine

A

very reactive, poisonous yellow gas

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2
Q

chlorine

A

fairly reactive, poisonous, dense green gas

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3
Q

bromine

A

dense, poisonous, red-brown volatile liquid

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4
Q

iodine

A

dark grey crystalline solid or a purple vapour

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5
Q

what do all halogens exist as?

A

molecules (pairs of atoms)

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6
Q

what is the trend in reactivity going down the group?

A

it decreases

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7
Q

why does the reactivity decrease as you go down the group?

A

the outer shell is further from the nucleus so the attraction is weaker meaning it is harder to gain an extra electron

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8
Q

what is the trend in melting and boiling points going down the group?

A

they increase

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9
Q

what is the trend in atomic mass going down the group?

A

it increases

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10
Q

how many electrons are on the outer shell?

A

7

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11
Q

what compounds do halogens form?

A

covalent and ionic

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12
Q

what ion do halogens form?

A

1-

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13
Q

when will a displacement reaction occur?

A

between a more reactive halogen and the salt of a less reactive one

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14
Q

what is the ion form of a halogen called?

A

halide

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15
Q

use of fluorine

A

toothpaste

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16
Q

uses of chlorine

A

kill bacteria
bleach
swimming pools

17
Q

uses of bromine

A

camera films
bromine water

18
Q

uses of iodine

A

antiseptic
tests for starch

19
Q

displacement reaction

A

a reaction when a more reactive element displaces a less reactive element from its compound

20
Q

5 characteristics of halogens

A

-7 electrons in outer shell
-coloured vapours
-diatomic molecules
-form ionic compounds
-form molecular compounds