Position of Hydrogen,Helium,Lanthanides and Actinides are exceptional in the periodic table explain why.
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The lanthanides and actinides form a group that appears almost disconnected from the rest of the periodic table. This is the f block of elements, known as the inner transition series. This is due to the proper numerical position between Groups 2 and 3 of the transition metals.Hydrogen doesn't have a fixed position in the periodic table. ... Hydrogen atom has the e- configuration 1s1 and is the first element to be placed as per the rule. It is placed with alkali metals because it can loose its one e- to form H+ just like the alkali metals. but hydrogen also resembles halogens.
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Because of their group no#, electronic configuration, radio activity and type of metals and their importance.
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