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the periodic table is a tabular arrangement of the chemical elements ordered by their atomic number number of protons in the nucleus electron configurations and recurring chemical properties the table also shows four rectangular blocks s p d and f blockhe periodic table is a tabular arrangement of the chemical elements ordered by their atomic number number of protons in the nucleus electron configurations and recurring chemical properties the table also shows four rectangular blocks s p d and f block
GROUPS. There are 18 groups (columns) in the periodic table. Group 1 (also known as the alkali metals) is the column on the far left of the table. Elements in the same group have similar, but not identical characteristics. This is because they all have the same number of electrons in their outermost shell.