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What do you mean by Modern …

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What do you mean by Modern periodic table
  • 2 answers

Smiling Every Time 3 years, 9 months ago

Modern periodic table is designed by *Henry Moseley* . It has 18 vertical columns called *groups* and 7 horizontal called *periods* .

Satakshi Sharma 3 years, 10 months ago

Modern periodic table is formed my Niels boar and he is the only discover who's inventions are being proved wrong.
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