ANSWER: 4
Explanation:
Periodic table has been given 4 new elements changing one of the most fundamental pieces of knowledge in science. The elements 113, 115, 117 and 118 will now be added to the 7th row of the table making it complete. The new elements were discovered by team from US, Russia and Japan and verified by the International Union of Pure and Applied Chemistry. All of the 4 new admissions are man-made. The new elements are the first to be added since 2011 when table got elements 114 and 116. New discoveries filled the 7th row or period of the table and existence and even properties of these elements have to be discovered before they can be added to the table. Elements are named after mythological concept, mineral, place, country, scientist or property.
Presently, the elements are named after their number: element 113 is referred to as ununtrium (which means 113-ium), and has the symbol Uut. Element 115 is called as ununpentium or Uup; While 117 is called ununseptium or Uus, 118 is called ununoctium or Uuo.
