Category: Periodic Table

Niobium Symbol Nb Atomic Number 41 Atomic Mass 92.906 g.mol -1 Discovered by Charles Hatchett in 1801 Chemical Properties of Niobium Group 5 Melting point 2410 °C Period 5 Boiling point 5100 °C Block d Density (g cm−3) 8.57 Atomic number 41 Relative atomic mass 92.906 State at 20°C Solid Key isotopes 93Nb Electron configuration… Continue reading Niobium

Zirconium Symbol Zr  Atomic Number 40 Atomic Mass 91.224 g.mol −1 Discovered by Martin Klaproth in the year 1798 Chemical Properties of Zirconium Group 4 Melting point 1854°C, 3369°F, 2127 K Period 5 Boiling point 4406°C, 7963°F, 4679 K Block d Density (g cm−3) 6.52 Atomic number 40 Relative atomic mass 91.224 State at 20°C Solid… Continue reading Zirconium

Yttrium Symbol Y Atomic Number 39 Atomic Mass 88.906 g.mol -1 Discovered by Johan Gadolin in 1794 Chemical Properties of Yttrium Group 3 Melting point 1522°C, 2772°F, 1795 K Period 5 Boiling point 3345°C, 6053°F, 3618 K Block d Density (g cm−3) 4.47  Atomic number 39 Relative atomic mass 88.906 State at 20°C Solid Key isotopes… Continue reading Yttrium

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… Continue reading Strontium

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… Continue reading Rubidium (Rb)

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… Continue reading Krypton

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… Continue reading Bromine – Br

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… Continue reading Selenium

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… Continue reading Arsenic

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… Continue reading Germanium