Science / Periodic Table of Elements Glossary

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 ra . . . View Full Definition

Lutetium (Lu): Atomic number: 71, Atomic mass: 174.97 g.mol -1, Electronegativity: 1.2, Density: 9.7 g.cm-3 at 20°C, Melting point: 1663 °C, Boiling point: 3395 °C, Vanderwaals radius: unknown, Ionic radiu . . . View Full Definition

Magnesium (Mg): Atomic number: 12, Atomic mass: 24.305 g.mol -1, Electronegativity: 1.2, Density: 1.74 g.cm -3 at 20 °C, Melting point: 650 °C, Boiling point: 1107 °C, Vanderwaals radius: 0.16 nm, Ionic rad . . . View Full Definition

Manganese (Mn): Atomic number: 25, Atomic mass: 54.9380 g.mol -1, Electronegativity: 1.5, Density: 7.43 g.cm-3 at 20°C, Melting point: 1247 °C, Boiling point: 2061 °C, Vanderwaals radius: 0.126 nm, Ionic ra . . . View Full Definition

Meitnerium (Mt): Atomic number: 109, Atomic mass: 265.9 g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unkn . . . View Full Definition

Mendelevium (Md): Atomic number: 101, Atomic mass: (258) g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unkn . . . View Full Definition

Mercury (Hg): Atomic number: 80, Atomic mass: 200.59 g.mol -1, Electronegativity: 1.9, Density: 13.6 g.cm-3 at 20°C, Melting point: - 38.9 °C, Boiling point: 356.6 °C, Vanderwaals radius: 0.157 nm, Ionic . . . View Full Definition

Metal: A metal is a substance that conducts heat and electricity, is shiny and reflects many colors of light, and can be hammered into sheets or drawn into wire. Metals lose electrons easily to for . . . View Full Definition

Molybdenum (Mo): Atomic number: 42, Atomic mass: 95.94 g.mol -1, Electronegativity: 1.8, Density: 10.2 g.cm-3 at 20°C, Melting point: 2610 °C, Boiling point: 4825 °C, Vanderwaals radius: 0.139 nm, Ionic radi . . . View Full Definition

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, Elect . . . View Full Definition

Neon (Ne): Atomic number: 10, Atomic mass: 20.179 g.mol -1, Electronegativity: unknown, Density: 0.9*10 -3 g.cm-3 at 20°C, Melting point: -249 °C, Boiling point: -246 °C, Vanderwaals radius: 0.16 nm, I . . . View Full Definition

Neptunium (Np): Atomic number: 93, Atomic mass: (237) g.mol -1, Electronegativity: 1.3, Density: 20.25 g.cm-3 at 20°C, Melting point: 640 °C, Boiling point: 3902 °C, Vanderwaals radius: unknown, Ionic radiu . . . View Full Definition

Nickel (Ni): Atomic number: 28, Atomic mass: 58.71 g.mol -1, Electronegativity: 1.8, Density: 8.9 g.cm-3 at 20°C, Melting point: 1453 °C, Boiling point: 2913 °C, Vanderwaals radius: 0.124 nm, Ionic radiu . . . View Full Definition

Niobium (Nb): Atomic number: 41, Atomic mass: 92.91 g.mol -1, Electronegativity: unknown, Density: 8.4 g.cm-3 at 20°C, Melting point: 2410 °C, Boiling point: 5100 °C, Vanderwaals radius: 0.143 nm, Ionic r . . . View Full Definition

Nitrogen (N): Atomic number: 7, Atomic mass: 14.0067 g.mol -1, Electronegativity: 3.0, Density: 1.25*10-3 g.cm-3 at 20°C, Melting point: -210 °C, Boiling point: -195.8 °C, Vanderwaals radius: 0.092 nm, Io . . . View Full Definition

Nobelium (No): Atomic number: 102, Atomic mass: 259 g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unknow . . . View Full Definition

Nonmetal: A nonmetal is a substance that conducts heat and electricity poorly, is brittle or waxy or gaseous, and cannot be hammered into sheets or drawn into wire. Nonmetals gain electrons easily to . . . View Full Definition

Osmium (Os): Atomic number: 76, Atomic mass: 190.2 g.mol -1, Electronegativity: 2.2, Density: 22.5 g.cm-3 at 20°C, Melting point: 3045 °C, Boiling point: 5027 °C, Vanderwaals radius: 0.136 nm, Ionic radi . . . View Full Definition

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