Question

give the salient feature of modern periodic table​

Answer 1

Answer:

Elements are arranged in the increasing order of atomic numbers.

Elements in the modern periodic table are arranged in 7 periods and 18 groups.

Horizontal rows are called periods and vertical columns are called groups

Explanation:

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Answer 2

Answer:

Modern periodic table is based on modern periodic law and elements are arranged in increasing order of their atomic numbers. Modern periodic table has 18 vertical columns called groups. Elements in any group of the periodic table have similar physical and chemical properties. There are 7 horizontal rows called periods.