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About the Rota Period
Rota Period Explained (pdf)
Rota Period Abstract Published in JSE (pdf)
Atomic Radius, Electronegativity, Electropositivity, First Ionization Energy, Mass + Z, Metallic Properties and Oxidation State Trends
*** Iron (Fe) is an example of how multi valence elements are displayed.
B - Boron
- Atomic Number: 5
- Atomic Weight (Mass): 10.81100
- Melting Point: 2300 °C
- Boiling Point: 2550 °C
- Orbital Class: 2p
- Orbital: 1s2 2s2 2p1
- Class: Other Non-metals
- Electronegativity: 2.0
- Density: 2.3 g.cm-3
- Van der Waals Radius: 200.pm
- Ionic Radius: 0.027 nm
- First Ionization Energy: 800.64 kJ mol-1
- Second Ionization Energy: 2427.09 kJ mol-1
- Third Ionization Energy: 3659.78 kJ mol-1
- Heat of Fusion: 22.2 kJ mol-1
- Heat of Vaporization: 504.5 kJ mol-1
- Heat of Atomization: 557.64 kJ mol-1
- Electrical Conductivity: 1.8E+12 µ Ωcm
- Thermal Conductivity: 27 W m-1 K-1
- Related To: B, Al, Sc, Co, Ni, Ga, Y, Ag, In, La, Nd, Pm, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, Au, Tl, Ac, Cm, Cf, Es, Fm, Md, No, Lr,
Boron has an energy band gap of 1.50 to 1.56 eV, which is higher than that of either silicon or Germanium. Optical characteristics include transmitting portions of the infrared. Boron is a poor conductor of electricity at room temperature but a good conductor at high temperature. Amorphous boron is used in pyrotechnic flares to provide a distinctive green color, and in rockets as an igniter Boric acid is also an important boron compound with major markets in textile products. Boron compounds are also extensively used in the manufacture of borosilicate glasses. The isotope Boron-10 is used as a control for nuclear reactors, as a shield for nuclear radiation, and in instruments used for detecting neutrons. Boron nitride has remarkable properties and can be used to make a material as hard as diamond. The nitride also behaves like an electrical insulator but conducts heat like a metal. Boron also has lubricating properties similar to graphite. The hydrides are easily oxidized with considerable energy liberation, and have been studied for use as rocket fuels. Demand is increasing for boron filaments, a high-strength, lightweight material chiefly employed for advanced aerospace structures Boron is similar to carbon in that it has a capacity to form stable covalently bonded molecular networks.
Boron is a Block P, Group 13, Period 2 element. The electronic configuration is [He] 2s2 2p1. In its elemental form boron's CAS number is 7440-42-8. The boron atom has a radius of 79.5.pm and it's Van der Waals radius is 200.pm.
Boron was first discovered by Sir Humphry Davy and J.L Gay-Lussac in 1808.
French: Bore, German: Bor, Italian: Boro, Portuguese: Boro, Spanish: Boro, Swedish: Bor
This element can be purchased in a variety of forms including as metal, compounds, ultra high purity, nanoparticles, and isotopes at www.americanelements.com
Click Here For More Information on Boron: Wikipedia.org