How To Use The Periodic Table
| Science It can be confusing working out the periodic table the first few times you use it. The vertical columns are the groups, or families. Horizontal lines are called periods. Elements in a group are alike in properties. The top number is the atomic number, and beneath the symbol for the element you see the atomic mass.
 Questions about periodic table:When Mendeleyev devised the periodic table, how did he discern how many electron...- Wed, Jan 14th 2009
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