The number of protons in the nucleus is equal to an elements atomic number, which determines that element's position in the Periodic Table.
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Lanthanum See Related Link
Cesium. See the link below for a periodic table
Ca is calcium. For information on the Periodic Table, see the link below.
by their atomic number
Johann Döbereiner discovered patterns in atomic masses that foreshadowed the periodic table. Please see the link.