Alkali metals

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Alkali metals
presented by
T
Jana Cvrková and Jan Ryšavý
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The Alkali Metals elements of Group 1
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Basic attributes of alkali metals

• all - silvery-coloured metals.
• soft, and can be easily cut with a knife to
  expose a shiny surface which dulls on oxidation.
• five of them show specific colours in flame.

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Lithium

• in 1817 by Johann Arfvedson (Sweden)
• lightest of all metals
• doesntt occur free in nature
• igneous rocks and in the waters of many mineral
  springs
• imparts a beautiful crimson color to a flame
• used in dry cells and storage batteries

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Sodium

• Sir Humphrey Davy in 1807 by electrolysis of
  caustic soda.
• fourth most abundant element on earth.
• in the manufacture of esters and in
• the preparation of organic compounds.
• should be handled with great care!!

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Potassium

• in 1807 by Sir Humphrey Davy
• the seventh most abundant of the
• earth's crust.
• in the ocean, but is present only in relatively
  small amounts, compared to sodium.
• essential constituent for plant growth and is
  found in most soils.

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Rubidium, Cesium and Francium

• Rubidium and Cesium was recognized by Bunsen and
  Kirchoff in second half of 19th century.
• Francium was discovered in 1939 in Paris
  (Marguerite Perey).
• Rubidium, alkaline metal, can be liquid
• at room temperature.
• Cesium is the most electropositive
• and most alkaline element.
• Francium is the heaviest known member of the
  alkali metals series/family.

Rb Cs
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QUIZ
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1.How many elements are in the Group 1? a) 7
M b) 8
K c) 6 A d) 6 and
half D
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2. Lithium compounds are used.. a) in the
manufacture of Teflon U b) as a reducing
agent in preparing other metals.
I c) in dry cells and storage
batteries. E d) in manufacture of Coca Cola
X
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3. What in abundance is Sodium on earth? a)
fifth R b) fourth
T c) sixth
D d)
fourty-seventh S
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4. Where can we find a few of Potassium? a) in
air E b) in oceans
A c) in fruit U d) in
a bathrom V
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5. Which element was recognized the latest? a)
Fr L b) Cs
K c) Rb A d) everyones
were recognized in the same time C
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6.How did you like this presentation?
a) It
was good. S b) It was realy
good. S c) Is it the last question?
S d) It was famous!! S
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Thanks for your attention !!! ?