Answer:
C. 118
Explanation:
The periodic table, alternatively referred to as the periodic table of elements, is an ordered list of the 118 chemical elements known to science. The chemical elements are listed in ascending sequence of increasing atomic number, or the number of protons in an atom's nucleus, which generally corresponds to increasing atomic mass. The periodic table is the primary source of chemistry information. It compiles an informative array of all the known elements. The elements are listed in ascending atomic number order from left to right and top to bottom. Generally, increasing atomic mass results in more demand. Periods direct to the horizontal rows of the periodic table, with each period number indicating the number of orbitals associated with the elements in that row. According to the Royal Society of Chemistry, Dmitri Mendeleev, a Russian chemist, and inventor, are credited with inventing the periodic table.
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