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Halogens. Group 7A (Group 17). “halogen”. Halos- salt Gen- “genesis”, to form SALT FORMERS. All halogens…. Have 7 electrons in their valence shell Have an oxidation number of -1 Exist, at room temperature, in all three phases of matter Form diatomic molecules. Diatomic molecules.

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Halogens


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halogens

Halogens

Group 7A

(Group 17)

halogen
“halogen”
  • Halos- salt
  • Gen- “genesis”, to form
  • SALT FORMERS
all halogens
All halogens…
  • Have 7 electrons in their valence shell
  • Have an oxidation number of -1
  • Exist, at room temperature, in all three phases of matter
  • Form diatomic molecules
diatomic molecules
Diatomic molecules
  • A molecule consisting of two atoms
  • F2, Cl2, Br2, I2, At2
fluorine
fluorine
  • Atomic Number 9
  • Gas at room temperature
  • F
  • Toothpaste- NaF
  • Pale, yellow gas
  • Fluere- “to flow”
  • In presence of H, burns

with reactive force

chlorine
chlorine
  • Atomic number 17
  • Poisonous, yellow-green gas
  • Cl
  • Bleach
  • PVC
  • DDT
  • HCl
  • CCl4
bromine
bromine
  • Atomic number 35
  • Liquid at room temperature
  • Br
  • Manufacture of photographic film
  • Thick, reddish-brown fumes when exposed to air
  • Bromos- “stench”
  • Chlorinated water with brackish water
iodine
iodine
  • Atomic number 53
  • Solid at room temperature
  • I
  • Iodes- “violet-colored”
  • Seaweed and brine wells
  • Poison
  • “tincture of iodine”- antiseptic
  • Important dietary supplement
  • I-131 half-life 8.1 days
astatine
astatine
  • Atomic number 85
  • Solid at room temperature
  • 20 radioactive isotopes
  • At-210 (t1/2=8.3 hrs)
  • Astatos- “unstable”
  • 1 millionth of 1 gram produced artifically
noble gases

Noble Gases

Group 8A

Group (18)

noble gases1
Noble gases
  • Considered completely inert until 1960
  • Oxidation number of 0
helium
helium
  • Atomic number 2
  • He
  • 2nd to Hydrogen in universe
  • Found in natural gas and results from radioactive decay
  • Very low density
  • US stockpiles
  • He-Ne laser in supermarkets
slide13
neon
  • Atomic number 10
  • Ne
  • Neos- “new”
  • 5th most common element in atmosphere (.002%)
  • 1898- Sir William Ramsay
argon
argon
  • Atomic number 18
  • Ar
  • Colorless and odorless
  • 1% of earth’s atmosphere
  • Argos- “lazy and inactive”
  • Commercially obtained by distillation of liquid air
  • Incandescent light bulbs
  • Potassium-argon dating
krypton
krypton
  • Atomic number 36
  • Kr
  • KrF4 (1966)
  • Krytos- “hidden”
  • Trace amounts in air
  • Odorless, colorless, tasteless, harmless
  • Pale purple- airport runway and approach lights
xenon
xenon
  • Atomic number 54
  • Xe
  • Density 5x air
  • Xenos- “the strange one”
  • Forms some compounds
  • Rapidly flashing strobe lights
radon
radon
  • Atomic number 86
  • Rn
  • 20 known radioactive isotopes
  • Radon-222 (t1/2= 3.82 days)
  • Tobacco- radon, uranium, lead: 1,000x greater than those working in nuclear power plants