Group 7- Halogens Flashcards

1
Q

Properties of halogens

A

-Have seven electrons in outer shell
-Exist as diatomic molecules, with weak, intermolecular forces
-Highly reactive and toxic
-Type of bonding between atoms is covalent
-Nonmetallic properties: brittle, dull, poor conductors

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2
Q

Trends down the group

A

-Melting and boiling points increase
-Density increases
-Colours get darker
- Bleaching affect decreases
-Reactivity decreases

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3
Q

Reactions with alkali metals

A

-Alkali metals react with halogens to produce metal halide (salts)

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4
Q

Example of an alkali metal reacting with a halogen

A

Lithium + chlorine —> lithium chloride
2Li (s) + Cl2 (g) —> 2LiCl(s)

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5
Q

What colour is fluorine at room temperature?

A

Yellow

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6
Q

What colour is fluorines vapour?

A

Yellow

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7
Q

What state is fluorine at room temperature?

A

Gas

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8
Q

What colour is chlorine at room temperature?

A

Green

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9
Q

What colour is chlorines vapour?

A

Green

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10
Q

What state is chlorine at room temperature?

A

Gas

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11
Q

What colour is bromine at room temperature?

A

Orange/brown

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12
Q

What colour is Bromines vapour?

A

Orange

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13
Q

What state is bromine at room temperature?

A

Liquid

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14
Q

What colour is iodine at room temperature?

A

Grey

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15
Q

What colour is iodines vapour?

A

Purple

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16
Q

What state is iodine in at room temperature?

A

Solid

17
Q

What are the most reactive elements in group one and group 7 start with?

A

An F

18
Q

what is the bleaching effect of fluorine?

A

very strong

19
Q

what is the bleaching effect of chlorine?

A

strong

20
Q

what is the bleaching effect of bromine?

A

weak

21
Q

what is the bleaching effect of iodine?

A

very weak

22
Q

how does the bleaching effect change as you go down group 7?

A

it decreases

23
Q

how do the melting and boiling points change as you go down group 7?

A

they increase

24
Q

what kind of elements are all the elements in group 7?

A

diatomic