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P-1 Periodic Classification of Element — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-1 Periodic Classification of Element2 Marks
Question
Define periods and groups of modern periodic table.
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Answer

The seven horizontal rows in the modern periodic table are called the periods 1 to 7 .
The eighteen vertical columns in the modern periodic table are called the groups 1 to 18 .

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