With reference to long form of the periodic table fill in the blank spaces with appropriate words.
The second and the third periods have _______ elements are called _________ periods.
A
eight
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B
short
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Solution
From the long form of the periodic table, it can be seen that the second and third period has eight elements each.
Due to the lesser number of elements, these periods are called short periods.
Period numbers 4, 5, and 6 have 18, 18, and 32 elements respectively, and are known as long periods.
The long form of the 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 the periodic table follows modern periodic law.
Therefore, the second and the third periods have eight elements are called short periods.
