In the long form of periodic table which period is:
Shortest
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Solution
From the long form of periodic table, it can be seen that the first period has two elements i.e.; Hydrogen (H) and Helium (He).
Due to the least number of elements in a period, this period is called as the very short or the shortest period.
Period number 2 and 3 has eight elements each and are called as short periods.
Period number 4, 5 and 6 have 18, 18 and 32 elements respectively and are known as long periods.
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.
The horizontal rows are called as periods.
The vertical columns are called as groups.
It has 18 groups or families and 7 rows or periods.
