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Chemistry 20 Online
OpenStudy (calculusxy):

Basic Periodic Table of Elements Question. MEDAL!

OpenStudy (calculusxy):

OpenStudy (aaronq):

The number at the top (82) is the atomic number, the periodic table is arranged in increasing atomic number - in horizontal rows (left to right) and downwards. Like this: 1 2 3 4 5 6 7 8 9 10 11 12

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