Question

i Modern Periodic table has 7 vertical columns
and 18 horizontal.
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Answer 1

Explanation:

The periodic table has seven horizontal rows and 18 vertical columns. The horizontal rows have metals towards the left and nonmetals on the right. The vertical columns have elements having similar chemical behaviours. The horizontal rows are called period and the vertical columns are called groups.

Answer 2

The Modern Periodic table has 18 vertical columns known as groups and 7 horizontal rows known as periods.