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Physical and Chemical Properties of Halogens

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Zora Williams

on 4 November 2014

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Transcript of Physical and Chemical Properties of Halogens

least reactive
"full" outer shell of 8 valence electrons
most form no compounds
Neil Bartlett of University of British Columbia reacted xenon with a fluorine-containing compound to form XeF4 and XeF6
only known compound of rypton is KrF2
no known compounds of He, Ne, or Ar
Radon can form compounds but its high radioactivity inhibits studies
Reactivity increases as atomic size increases
Physical Properties
weak interatomic forces
low boiling point
low melting point
low density
all gases at room temperature
extremely stable
outer shell are full
are monotomic gases under standard conditions
Chemical Properties
Chemical Properties
All halogens are electronegative. They gain electrons very quickly, making them the most reactive of all chemical elements.

this happens because of the atoms only need one more valence electron to attain noble gas configuration.
Florine is the most electronegative element because it has a small atomic radius and only requires one electron to become stable.

Halogens easily dissolve and dissociate into ions and can combine with surrounding elements to form compounds.
They form strong acids with Hydrogen except HF

Halogens are generally poisonous; each has a different level of toxicity; decreases the farther down in the group

They react with Hydrogen to form Hydrogen and form ionic compounds with the Alkali Metals

Usually Forms Precipitates with Ag

Extremely flammable; all corrosive

Can form both covalent and ionic bonds
Silcon Tetraflouride and Sodium Chloride

Physical Properties
Smaller atomic radii due to stronger attractive forces (more protons and electrons)
7 valence electrons
greater Ionic size
Iodine is a solid at room temperature
Bromine is a liquid at room temperature
Fluorine and Chlorine are gasses at room temperature
Noble Gases
Physical and Chemical Properties of Halogens and Nobel Gases
By: Zora Williams, William Shropshire, Johanna Ma, and Isabella Tidd
"Group 18: The Noble Gases." UC David Chemwiki. N.p., n.d. Web. 1 Nov. 2014.

Helmenstein, Anne Marie. "Noble Gases Properties of Element Groups." About
Education. N.p., n.d. Web. 1 Nov. 2014. <http://chemistry.about.com/

"The Noble Gases (Group 18)." Boundless. N.p., n.d. Web. 1 Nov. 2014.





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