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Selenium Selenium Symbol Se Atomic Number 34 Atomic Mass 78.91 Discovered by  Jöns Jacob Berzelius, Chemical Properties Of Selenium Group 16 Melting point 494 K Period 4 Boiling point 958 K Block p Density (g cm−3) 4.81 g/cm3 Atomic number 34 State at 20°C Solid Electron configuration [Ar] 3d104s24p4 What is Selenium? Selenium is a…

Arsenic Symbol As Atomic Number 33 Atomic Mass 74.922 Discovered by Arsenic was discovered by Albertus Magnus What is Arsenic? Arsenic, a chemical element placed in the nitrogen group of the periodic table that exists in both the gray and yellow crystalline forms. Arsenic is present in three allotropic forms- black, yellow and gray. A silver-gray and…

Germanium Symbol Ge Atomic Number 32 Atomic Mass 72.630 Discovered by Germanium was discovered by Clemens Winkler What is Germanium? Germanium, a chemical element places between silicon and tin in Group 14 of the periodic table. A hard, grey-white, lustrous and brittle metalloid acts in properties between metals and nonmetals. The element is mostly distributed…

Gallium Symbol Ga Atomic Number 31 Atomic Mass 69.72 g.mol -1 Discovered by Paul-Émile Lecoq de Boisbaudran Chemical Properties Of Gallium Group 13 Melting point 29.8 °C Period 4 Boiling point 2204 °C Block p Density (g cm−3) 5.91 Atomic number 31 Relative atomic mass 69.723 State at 20°C Solid Key isotopes 69Ga Electron configuration…

Zinc Symbol Zn Atomic Number 30 Atomic Mass 65.37 g.mol−1 Discovered by Andreas Marggraf Chemical Properties of Zinc Group 12 Melting point 419.527°C, 787.149°F, 692.677 K Period 4 Boiling point 907°C, 1665°F, 1180 K Block d Density (g cm−3) 7.134 Atomic number 30 Relative atomic mass 65.38   State at 20°C Solid Key isotopes 64Zn…

Copper (Cu) Copper Symbol Cu Atomic Number of Copper 29 Atomic Mass of Copper 63.546 g.cm-3 at 20°C  Discovered by – Chemical Properties Of Copper Group 11 Melting point 1084.62°C, 1984.32°F, 1357.77 K Period 4 Boiling point 2560°C, 4640°F, 2833 K Block d Density (g cm−3) 8.96 Atomic number 29 Relative atomic mass 63.546  State at…

Nickel Symbol Ni Atomic Number 28 Atomic Mass 58.693 Discovered by Nickel was discovered by Axel Fredrik Cronstedt Chemical Properties Of Nickel Group 10 Melting point 1455°C, 2651°F, 1728 K Period 4 Boiling point 2913°C, 5275°F, 3186 K Block d Density (g cm−3) 8.90 Atomic number 28 Relative atomic mass 58.693 State at 20°C Solid…

Cobalt Symbol Co Atomic Number 27 Atomic Mass 58.933 Discovered by Cobalt was discovered by Georg Brandt Chemical Properties Of Cobalt Group 9 Melting point 1495°C, 2723°F, 1768 K Period 4 Boiling point 2927°C, 5301°F, 3200 K Block d Density (g cm−3) 8.86 Atomic number 27 Relative atomic mass 58.933 State at 20°C Solid Key…

Manganese Manganese Symbol Mn Manganese Atomic Number 25 Manganese Atomic Mass 54.9380 g.mol-1 Discovered by Johan Gottlieb Gahn What is Manganese? Manganese, a chemical element that has a symbol Mn and atomic number 25. This element is not found as a free element in nature but available in combination with iron and other minerals. It is a…

Chromium Symbol Cr Atomic Number 24 Atomic Mass 51.996 g.mol -1 Discovered by Vaughlin in 1797 The Electronic configuration of chromium is [Ar]3d5 4s1. Chemical Properties Of Chromium Group 6 Melting point 1907 °C Period 4 Boiling point 2672 °C Block d Density (g cm−3) 7.19 g.cm-3 at 20°C Atomic number 24 Relative atomic mass 51.996 State at…