chemistry

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Which of the following os a true statement about the periodic table?
A. periods form horizonal rows;groups form vertical columns
B. groups form horizontal rows;periods form vertical columns
C. catagories form horizontal rows;gases form vertical columns
D. gases form horizontal rows; catagories form vertical columns

  • chemistry -

    would the answer be B?

  • chemistry -

    A is a true statement.
    B is not a true statement.
    Periods form rows; groups form columns.

  • chemistry -

    What is periodicity

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