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Which of the statement is incorrect about the modern periodic table?

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Rows in the periodic table are called periods.

From left to right atomic number increases

The modern periodic table has 15 columns

Columns in the periodic table are called groups

answer is A.

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Detailed Solution

The horizontal rows are called periods. The vertical columns are called groups. The periodic table involves 18 vertical columns and 7 horizontal rows.

The elements in a group have the same number of valence electrons.

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