Which of the following statements about the modern periodic table is correct?

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It has 18 horizontal columns called groups

It has 7 horizontal rows called periods

It has 135 elements

It is based upon atomic masses of elements

answer is A.

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Detailed Solution

The modern periodic table has 18 horizontal columns called groups.
Modern periodic law states that the properties of elements are dependent on their atomic numbers and elements show similar properties at regular intervals of increasing atomic numbers and the horizontal columns are groups and rows as periods. The modern periodic table consists of 118 elements.

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