Transcript Alkali metals

Alkali metals




Properties
Flame colors over the Bunsen burner
Application
Video on How alkali metals reacts with
water
Chintal Desai
Periodic table
Lithium (Lithos) (Li)
Crimson red flame


It is the first
member of the
Alkali Metal family.
Lithium is the
lightest of all
metals
Application of Li
It compounds are used in certain
kinds of glass and porcelain
products.
 More recently lithium has become
important in dry-cell batteries and
nuclear reactors.
 Some compounds of lithium have
been used to treat manic
depressives.

Sodium (Natria) Na

Sodium is perhaps the
most characteristic
alkali metal.
Silvery white
Golden yellow



Reacts violently with
water and rapidly with
the oxygen in air.
Soft enough to cut with
a knife.
It is the sixth most
abundant element in the
earth's crust.
Application of Na
Sodium in its elemental state it has
been used as a molten coolant in
nuclear reactors
 Is currently under research for
sodium/sulfur batteries.
 Its most common compounds for
industrial use include sodium
chloride, sodium hydroxide (lye),
sodium carbonate (washing soda)
and sodium sulfate.

Potassium (kalium ) K
pale lavender



The seventh most
abundant element.
Potassium is less
dense than water
Potassium reacts so
violently with water
that it bursts into
flame
Application of Potassium
Important compounds of potassium include
 potassium hydroxide (KOH) (used in some
drain cleaners),
 potassium superoxide, KO2,( used in
respiratory equipment )
 potassium nitrate, used in fertilizers and
pyrotechnics.
 Like sodium ions, the presence of
potassium ions in the body is essential for
the correct function of many cells
Rubidium (Latin: rubidius = red)



Is similar in physical
and chemical
characteristics to
potassium, but much
more reactive.
It is the seventeenth
most abundant
element.
Its melting point is so
low you could melt it
in your hand if you
had a fever (39oC).
(Dangerous!!)
Violet
Application of Rb
Rubidium was once thought to be
quite rare but recent discoveries of
large deposits indicate that there is
plenty to use.
 However at present it finds only
limited application in the
manufacture of cathode ray tubes.
