Topic 6- Groups In The Periodic Table

Question 1

Alkali metals

Answer 1

• group 1
• have 1 outer electron
• low melting and boiling points
• very soft
• form ionic compounds as they lose their outer electron easily

Question 2

Why are alkali metals very reactive?

Answer 2

They easily lose their outer electron to form a 1+ ion with a stable electron structure

Question 3

What happens as you go down group 1?

Answer 3

• they are more reactive

* as the outer electron is further away from the nucleus and is less strongly attracted

Question 4

Halogens

Answer 4

• group 7
• have 7 outer electrons
• melting points increase as you go down

Question 5

What happens as you go down group 7?

Answer 5

As you go down the group it gets less reactive

As it gets harder to attract the extra electron to fill the outer shel when it’s further away from the nucleus

Question 6

Properties of chlorine

Answer 6

• fairly reactive
• poisonous
• green gas (at room temperature)

Question 7

Properties of bromine

Answer 7

• poisonous

* red/brown liquid (at room temperature)

Question 8

Properties of iodine

Answer 8

• dark grey crystalline solid

* gives off purple vapour when heated

Question 9

Test for chlorine

Answer 9

•Holding a piece of damp blue litmus paper over it

•chlorine will bleach it
It may turn red for a moment as chlorine is acidic

Question 10

Displacement

Answer 10

A displacement reaction is where a more reactive element “pushes out” (displaces) a less reactive element from a compound

Question 11

Noble gases

Answer 11

• colourless gases at room temperature
• monatomic (made up of a single atom)
• not very reactive (don’t easily lose or gain electrons)
• non-flammable
• full outer electron shell

Question 12

How is argon used everyday?

Answer 12

• filament lamps
• flash photography
• welding

Question 13

How is helium used everyday?

Answer 13

•airships
•party balloons
(Floats as it has a lower density than air)