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13 cards from this deck
By atomic number (number of protons)
Horizontal rows
Vertical columns (numbered 1-7, plus group 0)
Few electrons
Lose electrons to form positive ions
Gain electrons to form negative ions
Share electrons
Yes
Same number of outer electrons
Count outer shell electrons - this equals group number
By atomic weight
Solved problems with element order in Mendeleev's table
Mercury
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