catherine, melissa, jennifer. the halogens are fluorine, chlorine, bromine, iodine, and astatine. ...
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![Page 1: Catherine, Melissa, Jennifer. The Halogens are fluorine, chlorine, bromine, iodine, and astatine. Halogen is derived from a Greek word meaning “salt-producing”](https://reader035.vdocuments.site/reader035/viewer/2022081508/56649f395503460f94c557e5/html5/thumbnails/1.jpg)
Catherine, Melissa, Jennifer
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The Halogens are fluorine, chlorine, bromine, iodine, and astatine.
Halogen is derived from a Greek word meaning “salt-producing”
Group 17 in the table. These certain elements are highly reactive oxidizers.
They all are missing 1 charge in their outer charge so they combine with many elements to form ions.
All have strong unpleasant odor and will burn flesh. Does not dissolve well in water.
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Highly toxic and can cause severe burns on contact
Used for etching glass Also used as a catalyst
to speed up chemical reactions
Used as a weapon in WWII
Used in toothpaste to strengthen
It is a pale green gas of low density
Atomic #:9, atomic mass: 18.998403 amu
#of protons/electrons: 9 # of neutrons: 10 Crystal structure: cubic # of energy levels:2 1st level- 2, 2nd level: 7 Date of discovery-
1886, Joseph Henn Moissan
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Used as a bleaching agent
Used as a disinfectant in swimming pools
Used as a weapon in WWI
Atomic #:17, atomic mass: 35.4527 amu
# of protons/electrons: 17
# of neutrons: 18 Crystal structure:
orthorhombic
Color: green In room temp form it
is a gas # of energy levels: 3 1st- 2, 2nd- 8, 3rd- 7 Date of discovery-
1774, Carl Wilhelm Scheele.
Uses: water purification, bleaches
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Foul smelling reddish-brown liquid
Used in dyes Used in applications
such as pesticides, disinfectants, medicines, and flame retardants
Was once used for an additive for gasoline containing lead.
Atomic #: 35, atomic mass:79.904 amu
#ofprotons/electrons:35 # of neutrons: 45 # of energy levels: 4,
1st- 2, 2nd- 8, 3rd- 18, 4th- 7
Date of discovery- 1826, Antoine J Balar
Uses- poisonous In room temp. form is a
liquid
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Iodine is important in the human diet
The thyroid gland produces a growth-regulating hormone that contains iodine, and lack of iodine can cause a goiter, a swelling around the neck
Was once used in the development of photography
Atomic #:53, atomic mass: 126.9044 amu
#of protons/electrons: 53 # of neutrons: 74
It’s a solid # of energy levels-5
1st- 2, 2nd- 8, 3rd- 18, 4th-18, 5th- 7
Date of discovery- 1811, Bernard Courtois
Uses: required in humans
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Unstable, it is difficult to say what applications it may have. Also not found in nature.
The most promising area involves the use of astatine to treat a condition known as hyperthyroidism, related to an overly active thyroid gland
Atomic #: 85, atomic mass: 210.0 amu
#of protons/electrons: 85, # of neutrons: 125
Energy levels: 6, 1st- 2, 2nd- 8, 3rd- 18, 4th- 32, 5th- 18, 6th- 7
Date of dicovery- 1940, D.R. Corson
No uses known Is a solid in room
temp.
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http://www.scienceclarified.com/everyday/Real-Life-Chemistry-Vol-2/Halogens.html
www.theodoregray.com/periodictable http://www.chem4kids.com/files/
elem_families.html http://www.chemtutor.com/perich.htm http://www.learner.org/interactives/
periodic/groups.html