By: Nick Nugent and Matt Muzzio

Halogens(group 17)

Group Name: HalogensGroup Number: 17

Halogens

F(Fluorine)Cl(Chlorine)

Br(Bromine)

I(Iodine)

At(Astatine)

Electron configuration: np5

Physical Properties:• Melting point is 219.6 degrees Celsius• Boiling Point is -188.12 degrees Celsius• Pale, yellow gas• Doesn’t conduct electricity, poor insulator

Chemical Properties:• The most reactive element in the universe• Reactive in almost every circumstance, but it doesn’t react with the

Noble Gases

-Only found in nature as compounds

-It is used in toothpaste, used in refrigerants, and is to use to make Teflon plastic

Fluorine(F)

Chlorine(Cl) Physical Properties:• Melting Point -101 degrees Celsius• Boiling Point -34 degrees Celsius • Green yellow gas• Heavier than air, doesn’t float• Doesn’t conduct electricity, poor insulator

Chemical Properties:• Very reactive, reacts with almost all elements, except noble gases• Very vigorous reactions• Reacts explosively with hydrogen • Forms hydrochloric acid when mixed with water- Only occurs as compounds in nature-Added to water and pools as a disinfectant, and is used to make PVC plastic

Physical Properties:• One of two elements that are liquids at room temperature• Freezing Point -7.3 degrees Celsius • Boiling Point 58.8 degrees Celsius• Dark red-brown liquid which forms a red-brown vapor• Bromine only conducts electricity when bonded with another

element, but is a good insulator

Chemical Properties:• Very reactive but less reactive than fluorine and chlorine• It reacts explosively with potassium • Even reacts with platinum and palladium-It’s elemental form isn’t found in nature, Most common compound NaBr-Used to manufacture fire retardants, pesticides, and components of photographic film

Bromine(Br)

Physical Properties:• Nonmetallic, nearly black solid• Melting Point (K): 386.7• Boiling Point (K): 457.5• Some isotopes radioactive• Iodine is not a good conductor, nor is it a good insulator

Chemical Properties:• Very reactive but less than fluorine, chlorine, and bromine• Reactive under most circumstances

-Only occurs as compounds in nature- Required in small amounts by humans for nutrition. It was once used as an antiseptic. Also used in dyes and photography.

Iodine(I)

Physical Properties:• The properties of Astatine are mostly unknown• Melting point of 302°C• Properties like iodine, though Astatine has more metallic

propertiesChemical Properties:• The only chemical properties are assumptions that it may

have similar properties as the other halogens-Due to the extreme rarity and short half life of the element, barely any experiments with the element have been conducted-There are no known uses for the element, but it is a possible cure to thyroid cancer-It is one of the rarest elements in the universe

Astatine(At)