Science / Periodic Table of Elements / Lithium (Li): Atomic number: 3, Atomic mass: 6.941 g.mol -1, Electronegativity: 1.0, Density: 0.53 g.cm -3 at 20 ?°C, Melting point: 180.5 ?°C, Boiling point: 1342 ?°C, Vanderwaals radius: 0.145 nm, Ionic radius MORE
Technology / Cell Phones / Lithium-Ion Battery (Li-Ion): Lighter weight battery than earlier types, having relatively longer cycle life and generally do not suffer from memory effect. MORE
Science / Periodic Table of Elements / Actinium (Ac): Atomic number: 89, Atomic mass: 227 g.mol -1, Electronegativity: 1.1, Density: 10.07 g.cm-3 at 20?°C, Melting point: 1050 ?°C, Boiling point: 3250 ?°C, Vanderwaals radius: unknown, Ionic radius: un MORE
Science / Psychiatry / Beta-Blocker: An agent that inhibits the action of beta-adrenergic receptors, which modulate cardiac functions, respiratory functions, and the dilation of blood vessels. Beta-blockers are of value in the treatment MORE
Business / Agriculture / Nitrogen: An element found in the air and in all plant and animal tissues. For many crops, nitrogen fertilizer is essential for economic yields. However, nitrogen can also be a pollutant when nitrogen compounds MORE
Science / Chemistry / Alkali Metal: (alkaline earth metal) alkali metal element The Group 1 elements, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr) react with cold water for form strongly alkali MORE