Lanthanoids and actinoids are numbered as 101 and 102 to separate them in sorting by group. It is organized in order of increasing atomic number. The Periodic Table Of Elements 30 Min Chemistry Lesson Periodic The atomic number of an element is the number of protons in the nucleus of an atom of that element. The periodic table of elements . Metals reside on the left side of the table while non metals reside on the right. Order generally coincides with increasing atomic mass. The periodic table is a tabular arrangement of the chemical elements. The rows are called periods. Elements are arranged from left to right and top to bottom in order of increasing atomic number. The periodic table also known as the periodic table of elements is organized so scientists can quickly discern the properties of individual elements such as their mass electron number electron configuration and their unique chemical properties. Seeing chemical elements arranged in the modern periodic
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