The Periodic Table

Argon

Argon

________- filling (tungsten) light bulbs to stop the filament reacting with oxygen.

Helium

________- filling balloons and aircrafts because it is lighter than air and will not catch fire.

Periodic table

The ________ is a method of classifying elements.

Neon

________- is used in advertising signs because it glows red.

Elements

________ are arranged in order of increasing atomic number (each proceeding ________ has one more proton)

Period number

number of electron shells

Group number

number of valency electrons (outer shell electrons)

Group I metals

Lithium, sodium and potassium

Fluorine

Yellow gas

Chlorine

Green gas

Bromine

Red liquid

Iodine

Black solid

Helium

filling balloons and aircrafts because it is lighter than air and will not catch fire

Argon

filling (tungsten) light bulbs to stop the filament reacting with oxygen

Neon

is used in advertising signs because it glows red