12. In 18 groups and 7 periods elements are arranged in ___ periodic table
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Answer:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups.
Explanation:
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Maryshey:
Modern periodic table was the answer. it was invented by Henry Moseley contains the element which are arranged in 18 group and 7 period
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Answer:
order of increasing atomic number in
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