Below is a modified Periodic Table.
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The first periodic table was created by Dmitri Mendeleev, a Russian chemist, in the late 1800s. By that time, there were 70 elements known. Mendeleev ordered the elements by increasing atomic mass. His periodic table looked something like this. Mendeleev left spaces in his table, thinking that undiscovered elements would fit into the blanks. He was correct.
In 1913, Henry Moseley, a British physicist, determined the atomic number of all the known elements. He then arranged them by their atomic number, thereby creating the Periodic Table we use today!
The modern Periodic Table has horizontal rows, called periods and vertical groups called families. Periodic trends exist within each family and period.
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