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The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties.
This ordering shows periodic trends, such as elements with similar behaviour in the same column.
Thus, it is relatively easy to predict the chemical properties of an element if one knows the properties of the elements around it., the periodic table has 118 confirmed elements, from element 1 (hydrogen) to 118 (oganesson).
No element heavier than einsteinium (element 99) has ever been observed in macroscopic quantities in its pure form, nor has astatine (element 85); francium (element 87) has been only photographed in the form of light emitted from microscopic quantities (300,000 atoms).
A group or family is a vertical column in the periodic table.
Elements 113, 115, 117 and 118, the most recent discoveries, were officially confirmed by the International Union of Pure and Applied Chemistry (IUPAC) in December 2015.
Their proposed names, nihonium (Nh), moscovium (Mc), tennessine (Ts) and oganesson (Og) respectively, were announced by the IUPAC in June 2016 and made official in November 2016.