Two notable exceptions include silver and mercury. Most elements are represented by the first letter or first two letters of their English name, but there are some exceptions. For example, “H” denotes hydrogen, “Li” denotes lithium, and so on. In the typical periodic table, each element is listed by its element symbol and atomic number. The periodic table only lists chemical elements, and it includes each isotope of each element within one cell. The periodic table is structured as an 18 X 7 grid positioned above a smaller double row of elements. ![]() ![]() period: A horizontal row in the periodic table which signifies the total number of electron shells in an element’s atom.group: A vertical column in the periodic table which signifies the number of valence shell electrons in an element’s atom.atomic number: The number, equal to the number of protons in an atom, that determines its chemical properties.All elements within a certain group thus share similar properties. The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons.The arrangement of the periodic table leads us to visualize certain trends among the atoms.The periodic table lists all the elements with information about their atomic weights, chemical symbols, and atomic numbers.
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