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The Periodic Table (Grouping Elements (Group 1: The alkali metals…
The Periodic Table
Grouping Elements
Over 100 hounded elements
Periods are horizontal rows of elements in the periodic table
Group 1: The alkali metals
Have one electron in the outer shell
Atoms are keen to get rid of this loose electron
Very reactive and behave similar
Electrons in the group
Lithium
Sodium
Potassium
Properties
Soft and easily cut
Quickly lose their shine
Stored in oil
Conduct electricity
Low density (floats on water)
Low melting point
Group 2: The alkaline earth metals
Members include
Beryllium
Magnesium
Calcium
Elements have two electrons in their outer shell
Not as reactive as group 1
Group 7: The halogens
Have seven electrons in their outer shell
Members include
Flurine
Chlorine
Elements in this group are trying to gain an electron
Group 8: The noble gases
Are all gases and have full outer shells
They are unreactive and are very stable
Members include
Helium
Neon
Argon
Modern Periodic Table
Has no gaps in it
Elements which have similar chemical properties are placed in columns called groups
Arranged according to atomic number not atomic mass
What is it?
Shows the elements in order of increasing atonic numbers
Arranged into groups of vertical columns of elements