summarize the general characteristics of the modern periodic table.
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1.it have 18 vertical columns called groups and 7 horizontal rows are called periods
2.no.of periods determine the no.of shells present in an element .
3.where as the no.of groups determine the no.of valence electrons
4.hydrogen have acquired a unique position.
2.no.of periods determine the no.of shells present in an element .
3.where as the no.of groups determine the no.of valence electrons
4.hydrogen have acquired a unique position.
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