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What are Halogens? Define Halogens
Halogens is a term used in
Periodic Chemistry
when classifying the chemical elements. Each element can usually be
classified as a metal or a non-metal based on their general
Physical and Chemical Properties. The word Halogens is derived from the Greek word 'hals'
meaning "salt" or "sea", and 'gen' from the Greek word 'gígnomai meaning
"come to be" for an element that produces a salt when it forms a compound
with a metal.
Halogens List - Chemical Elements in the Periodic Table
The elements contained in
the classification of Halogens list are as follows:
What are Halogens? Common Properties of Halogens
Halogens are highly reactive can be
found in many minerals and in seawater. At room temperature and pressure,
fluorine and chlorine are gases, bromine is a liquid and iodine and astatine
are solids. Group 17 is therefore the only periodic table group exhibiting
all three states of matter at room temperature.
Common properties of Halogens
The elements classed as Halogens have the following
properties in common:
-
They are
non-metals
-
Low
melting and boiling points
-
Brittle
when solid
-
Poor
conductors of heat and electricity
-
Have
coloured vapours
-
Their
molecules each contain two atoms
Elements classified as Halogens
The 5 elements classified as "Halogens" are located in Group
17 of
the Periodic Table. Halogens are combined with
Silver
to produce
the light sensitive crystals used as the basis for
photographic emulsions.
The term "halogen" means "salt-former" and compounds
containing halogens are called "salts". The halogens exist, at
room temperature, in all three states of matter - Gases such
as Fluorine & Chlorine, Solids such as Iodine and Astatine and
Liquid as in Bromine.
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