Periodic table Definition & Meaning - Merriam-Webster

It is called periodic because elements are lined up in cycles or periods From left to right elements are lined up in rows based on their atomic number (the

Scientists Say: Periodic table In the periodic table, elements are lined up by atomic number, the number of protons they have An element's

periodic table of elements PERIODIC TABLE OF THE ELEMENTS 1 2 H He 2 13 14 15 16 17 3 Li 11 Na 4 Be 12 Mg 3 4 5 6 7 8

pg slot table The definitive online periodic table reference site including technical data, and photographs and descriptions of thousands of samples of the chemical