Question

features of morden periodic table
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Answer 1

Answer:

The main features of modern periodic table

• 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.

Answer 2

Explanation:

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.