what is characteristic of F block
Answers
Explanation:
Properties of F block Elements
Have electrons added to the ‘f’ sub-orbitals of (n-2) level
Are placed between (n-1)d and ns block elements in the periodic table.
Properties are similar to d-block elements.
Properties of Lanthanides
Lanthanides are soft metals with a silvery white colour.
Their colour dulls and their brightness reduces rapidly when exposed to air.
They have melting points ranging from 1000K to 1200K (Except Samarium, 1623K).
Lanthanides are good conductors of heat and electricity.
They are non-radioactive in nature with the exception of Promethium
A decrease in atomic and ionic radii from lanthanum to lutetium is observed. This is called the lanthanoid contraction.
Properties of Actinides
The Actinide elements appear to be silvery in colour.
These elements have a radioactive nature.
These metals are highly reactive and their reactivity increases when they are finely divided.
A decrease in atomic and ionic radii from Actinium to Lawrencium is observed. This is called the actinoid contraction.
They generally exhibit an oxidation state of +3. However, elements belonging to the first half of the series are known to exhibit higher oxidation states quite frequently.
DEADSOUL
Answer:
General characteristics of f-block elements.
They exhibit variable oxidation states. They form coloured ions. They have the tendency to form complex compounds. Actinoids are radioactive in nature.
Explanation:
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