Question

Mendeleev provided no space for the elements of a group, but these when discovered, were
placed in this table without disturbing the arrangement of other elements. These elements
are called
1) Pnictogens 2) Halogens 3) Noble gases 4) Alkali metals​

Answer 1

Answer:

noble gases

Explanation:

this is because

noble gases have an octet shell electronic configuration due to which they dont react with other elements .

so all noble gases have similar properties hence a new coloum could be made and it wouldn't disturb the existing table.

this was one of the advantages of mendeleev's table

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