With reference to long form of the periodic table fill in the blank spaces with appropriate words.
Noble _ are placed in group in last ____ of the periodic table.

gases, 18^th

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Solution

Noble gases or inert gases are the elements which have fully filled outermost shell and are chemically nonreactive.
These noble gases are present on the extreme right side of the long form of periodic table in the group-18 as shown below.
Example: Helium (He), Neon (Ne) etc.
Long form of periodic Table: In the long form of the periodic table, elements are arranged in the order of their increasing atomic number in the tabular form.
It has 18 vertical groups or columns and 7 horizontal rows or series.
The long form of periodic table follows modern periodic law.
Therefore, noble gases are placed in 18^th group in last group of the periodic table.

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