# 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 -

• 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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