this table of elements is organized by the atomic weights of the element. each horizontal row on the periodic table (going left or right) is called a period. each vertical row of the table (going up or down) is called a group. the periodic table is called that because a periodic is describing something that occurs or repeats at regular intervals. which means happening at regular intervals.
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Isotopes are atoms of the same elements with different number of neutrons. The proton and the electron numbers are the same. They are just heavier, lighter, and sometimes unstable (radioactive) versions of the same element. The atomic number is what makes an element unique. Radioactively decay can change the ammount of protons and neutrons. Numbers of neutrons can vary, protons can't. |