The day of 30 December 2015 has become highly memorable, as it has brought huge success in the field of science and technology. The scientists from Pure and Applied Chemistry (IUPAC) has announced that they have completed 7th row of period table through discovering four new elements 113, 115, 117 and 118. The periodic table shows the chemical elements in tabular form, arranged according to their atomic numbers, electron configurations and chemical properties. The table consists of both rows (periods) and columns (groups). The chemists have classified elements by the number of protons per atom (atomic numbers). On 30th December 2015, the scientists have announced that they have discovered all elements from atomic number 1 (hydrogen) to 118 (Ununoctium) through adding four new elements 113, 115, 117 and 118. The discovery of four new elements has completed the 7th line of period table.
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