Author: misamaliraza94

Strontium Symbol Sr Atomic Number 38 Atomic Mass 87.62 g.mol -1 Discovered by Adair Crawford in 1790 Chemical Properties of Strontium Group 2 Melting point 777°C, 1431°F, 1050 K Period 5 Boiling point 1377°C, 2511°F, 1650 K Block s Density (g cm−3) 2.64  Atomic number 38 Relative atomic mass 87.62 State at 20°C Solid Key isotopes…

Rubidium Symbol Rb Atomic Number 37 Atomic Mass 85.4678 g.mol -1 Discovered by Gustav Kirchhoff and Robert Bunsen Chemical Properties of Rubidium Group 1 Melting point 39.30°C, 102.74°F, 312.45 K Period 5 Boiling point 688°C, 1270°F, 961 K Block s Density (g cm−3) 1.53 Atomic number 37 Relative atomic mass 85.468   State at 20°C…

Krypton (Kr) Symbol Kr Atomic Number 36 Atomic Mass 83.798 Discovered by Krypton was discovered by Sir William Ramsay and Morris Travers Chemical Properties Of Krypton Group 18   Melting point −157.37°C, −251.27°F, 115.78 K   Period 4 Boiling point −153.415°C, −244.147°F, 119.735 K    Block p Density (g cm−3) 0.003425   Atomic number 36…

Bromine Bromine Symbol Br Bromine Atomic Number 35 Bromine Atomic Mass 79.904 g.mol-1 Discovered by Johan Gottlieb Gahn What is Bromine? It is the third-largest halogen and at room temperature, it appears as a fuming red-brown liquid. Bromine was discovered by two chemists independently. Chemical Properties Of Bromine Group 17 Melting point −7.2°C, 19°F, 266 K Period 4…

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…