In the 6th period of periodic table, 14 elements are
placed in the III group. They are known as:
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THEY ARE KNOWN AS RARE EARTHS...
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In the 6th period of the periodic table, 14 elements placed in the III group are known as Lanthanoids.
- F block elements consist of two series of lanthanoids and actinoids. lanthanoids are 15 elements.
- They are reactive and the characteristics of the other 14 elements resemble lanthanum.
- They are silver-coloured.
- The last electrons are filled in valence shell 5d.
- +2,+3 and +4 oxidation states are possible on lanthanides but +3 is stable. +3 and +4 containing species behave as a good oxidising agent as they want to acquire a stable +3 oxidation state.
- They are soft but they have high melting and boiling point.
- They are ionic and most of them are paramagnetic.
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