Hydrogen is the first element in the periodic table because it has atomic number one, which means that it has only one proton in its atom and thus only one electron in its outermost shell. The placement of elements in the periodic table is based on their electronic configuration.
Position of Hydrogen in Periodic Table
|Oxidation States||1, -1|
|Atomic Radius||78 pm|
|Boiling Point||-252.87° C|
|At Room Temperature||Colorless & Odorless Diatomic Gas|
What is the Position of Hydrogen in the Modern Periodic Table?
Hydrogen is an element that possesses unique properties. It has one electron in its valence shell similar to alkali metals and resembles them in several properties. Therefore, it should be placed in group 1 along with the alkali metals.
On the other hand, like halogens of group 17, only one electron needs to attain the stable noble gas configuration. Hence, it also resembles halogens and can be grouped with them in group 17. Thus, the position of hydrogen is debatable.
Differences with Metals
Similarities of Hydrogen to Metals
Difference with Halogens
NCERT MCQ Questions for Class 11 Chemistry with Answers
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