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Periodic Classification
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The modern periodic table has elements arranged in increasing atomic numbers. It has ___________vertical columns and ________horizontal rows.
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A
18 and 7
💡 Explanation:
Yes, it is correct. The standard form of the table consists of a grid of elements laid out in 18 columns and 7 rows. The lanthanides and actinides are accommodated in 6th and 7th periods respectively.