![]() ![]() Each column in the periodic table, going from top to bottom, represents one of these groups. The elements are also organized into groups, or families, that share similar physical and chemical properties. ![]() At the other extreme, an atom of the synthetic element oganesson has 118 protons and an atomic number of 118. For instance, the first element in the periodic table, hydrogen, has an atomic number of 1, because a hydrogen atom has only 1 proton. Each element has its own atomic number, which represents the number of protons in one atom of the element. As you move across the table, the number of protons and the atomic mass of each element increases. When you’re reading the periodic table, move across the table from top left to bottom right. But it’s not too difficult to understand once you learn the basics of how it works. The periodic table can seem a little daunting at first.
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