Why should hydrogen be assigned a separate position in the periodic table?

Given below are the names of few elements based on their position in the periodic table. Identify the element which is not correctly placed.

Describe the position of noble gases in the periodic table .

An element A has 2 electrons in its, fourth shell. State position in the periodic table

Comment on the dual position of Hydrogen in the periodic table.

.................. (Hydrogen / Helium) has the highest ionisation energy in the periodic table.

Name the element whose properties can be predicted on the basis of its position in the periodic table given by Mendeleev's.

• In this table H does not represent hydrogen. • Some elements are given in their own symbol and position in the periodic table. • While others are shown with a letter. With reference to the table answer the following questions : Identify the noble gas of the fourth period.

In the above table - H does not represent hydrogen. Some elements are in their own symbol & position in the periodic table while others are shown with a letter. Identify The element from period 3 with least atomic size.

• In this table H does not represent hydrogen. • Some elements are given in their own symbol and position in the periodic table. • While others are shown with a letter. With reference to the table answer the following questions : Identify the most electronegative element.

In this table H does not represent hydrogen. Some elements are given in their own symbol and position in the periodic table. While others are shown with a letter. With reference to the table answer the question : Identify the least reactive element of group 1.