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Give a brief description on the position of hydrogen in the
periodic table?
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Answer Posted / mukul
As elements are arranged in the increasing order of their atomic number in the modern periodic table, the position of hydrogen in group I and period I is justified.
It is true that hydrogen resembles both with alkali metals and halogens in some of their properties but elements are not arranged according their properties in the modern periodic table. The chemical properties of a group are the consequence of similar outer electronic configurations.
If we arrange the elements according to their properties, Li must be placed in II group along with Mg because of greater similarities (Diagonal relationship) between two. Similar diagonal relation also observe between Be and Al; B and Si.
More ever,transition elements have more similarities among themselves even though they are placed in a separate group i.e according to their atomic number from group III to group XII.
A plot of √ν (where ν is frequency of X-rays emitted) against atomic number (Z ) gave a straight line , as per Henry Moseley who formulated modern periodic law. The law was not formulated on the basis of properties of elements.
Keeping in view of above facts, placement of hydrogen in group I and period I seems more appropriate than placing in the center or any other place in the periodic table.
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