Groups In The Periodic Table Flashcards
What group are the alkali metals?
1
What happens to the melting points of the alkali metals as you go down the group?
They decrease
What happens to the reactivity as you go down the alkali metals?
Reactivity increases
What are 2 properties of alkali metals?
Low melting and boiling points
Very soft
What do alkali metals form?
Ionic compounds
Alkali metal + water…
—> metal hydroxide + hydrogen
What happens to lithium in water? (3)
Moves around the surface
Fizzes
Dissolves
What happens to sodium and potassium in water? (3)
Move around surface
Fizz
Melt
What happens to potassium in water?
It glows
What group are the halogens?
7
What happens to the melting point of halogens as you go down the group?
They increase
What happens to the reactivity of the halogens as you go down the group?
It decreases
What is chlorine like at room temperature?
Pale green gas
What is bromine like at room temperature?
Red/brown liquid
What is iodine like at room temperature?
Dark grey solid
Halogen+hydrogen…
—> hydrogen halide
What group are the noble gases?
0
What are the 4 properties of noble gases?
Colourless
Low melting and boiling points
Poor conductors
Non flammable
What is helium used for?
Balloons
Why is helium used for balloons? (2)
Lower density than air
Non flammable
What is neon used for?
Lights
What is argon used for?
Filament lamps
What is krypton used for?
Photography
What does inert mean?
Don’t react easily with anything
Noble gases are I….
Inert
What decreases down the group of noble gases? (3)
Melting point
Boiling point
Density
Why do noble gases exist as single atoms?
Because they don’t form bonds easily with other atoms
