Science / Chemistry / Boron: (B) Element 5, atomic weight 10.811. Hard yellow crystals or brown amorphous powder, used as a neutron absorber in nuclear chemistry and as a hardener in alloys.

Boron (B)

Science / Periodic Table of Elements / Boron (B): Atomic number: 5, Atomic mass: 10.81 g.mol -1, Electronegativity: 2.0, Density: 2.3 at 20°C, Melting point: 2076 °C, Boiling point: 3927 °C, Vanderwaals radius: 0.098 nm, Ionic radius: 0.027 MORE

Neodymium (Nd)

Science / Periodic Table of Elements / Neodymium (Nd): Atomic number: 60, Atomic mass: 144.2 g mol -1, Electronegativity: 1.14, Density: 7.0 g cm-3, Melting point: 1024 °C, Boiling point: 3074 °C, Vanderwaals radius: 0.181 nm, Isotopes: 9, Electronic sh MORE


Science / Chemistry / Abrasive: A very hard, brittle, heat-resistant substance that is used to grind the edges or rough surfaces of an object. boron carbide, diamond, and corundum are abrasives. MORE


Science / Biology / Micronutrients: Elements that are required by plants in very small quantities, but are toxic in large quantities: iron, manganese, molybdenum, copper, boron, zinc, and chloride. MORE