Periodic Table Review Flashcards

Flashcards to review lecture notes on the Halogens, Noble Gases, and Hydrogen from the periodic table.

Halogens

Group 7 elements including Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), Astatine (At), and Tennessine (Ts).

Halogen Melting and Boiling Points

Increase as you go down the group.

Halogen Reactivity

Decreases as you go down the group.

Fluorine Reaction with Water

Vigorous reaction, producing hydrogen fluoride.

Chlorine Reaction with Water

Dissolves in water and produces hydrochloric acid and hypochlorous acid.

Bromine Reaction with Water

Dissolves in water and reacts more slowly to form hydrogen bromide and hypobromous acid.

Fluorine Uses

Etching glass surfaces (as hydrogen fluoride), added to drinking water to prevent tooth decay (as sodium fluoride), and as a component of chlorofluorocarbons (CFCs).

Chlorine Uses

Kills bacteria in water supply systems, used to manufacture bleach, and forms hydrochloric acid.

Bromine Uses

Used with silver in traditional photography (silver bromide).

Noble Gases

Group 8 elements including Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe).

Noble Gases Reactivity

Very unreactive (inert).

Helium Uses

Meteorological balloons and mixed with oxygen to help deep-sea divers breathe underwater.

Neon Uses

Neon lights for advertising displays.

Argon Uses

Used in wire-filament light bulbs to prevent the tungsten wire from reacting with oxygen.

Krypton Uses

Used in lights with high intensity.

Xenon Uses

Used for the bright light in a photographer’s flashlight or a car’s headlights.

Hydrogen Placement in Periodic Table

Placed alone because its properties do not match well with other elements.

Hydrogen Properties

Lightest atom, colorless gas without smell.

Hydrogen Reactivity

Explodes when mixed with air or oxygen and ignited.

Hydrogen Uses

Found in acids, combines with carbon atoms to form hydrocarbons, and combines with nitrogen atoms to form ammonia for use in fertilizers.

Futuristic Use of Hydrogen

Fuel source for cars, producing water vapor and electricity without carbon dioxide emissions.