Question

write down the shailent features of modern periodic table and periodicity of elements in periods and groups ​

Answer 1

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• 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.

Modern periodic law states that physical and chemicals properties of elements are periodic functions of their atomic numbers. 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.