Isotopes: Atoms with the same atomic number but different numbers of neutrons; indicated by adding the mass number to the elements name, e.g., carbon 12 or 12C.

 

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Isotopes: Atoms with the same atomic number but different numbers of neutrons; indicated by adding the mass number to the elements name, e.g., carbon 12 or 12C.

Rubidium (Rb): Atomic number: 37, Atomic mass: 85.4678 g.mol -1, Electronegativity: 0.8, Density: 1.53 g.cm-3 at 20°C, Melting point: 39 °C, Boiling point: 696 °C, Vanderwaals radius: 0.243 nm, Ionic radiu . . . View Full Definition

Ruthenium (Ru): Atomic number: 44, Atomic mass: 101.1 g.mol -1, Electronegativity: 2.2, Density: 12.2 g.cm-3 at 20°C, Melting point: 2250 °C, Boiling point: 4150 °C, Vanderwaals radius: 0.135 nm, Isotopes: . . . View Full Definition

Rhodium (Rh): Atomic number: 45, Atomic mass: 102.91 g.mol -1, Electronegativity: 2.2, Density: 12.4 g.cm-3 at 20°C, Melting point: 1970 °C, Boiling point: 3727 °C, Isotopes: 9, Electronic shell: [ Kr ] 4 . . . View Full Definition

Radon (Rn): Atomic number: 86, Atomic mass: (222) g.mol -1, Electronegativity: unknown, Density: 9.96*10-3g.cm3 at 20°C, Melting point: - 71 °C, Boiling point: - 62 °C, Vanderwaals radius: unknown, Ioni . . . View Full Definition

Radium (Ra): Atomic number: 88, Atomic mass: 226.0254 g.mol -1, Electronegativity: 0.9, Density: 5 g.cm-3 at 20°C, Melting point: 700 °C, Boiling point: 1140 °C, Vanderwaals radius: 0.230 nm, Ionic radiu . . . View Full Definition

Rutherfordium (Rf): Atomic number: 104, Atomic mass: 260.9 g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unkn . . . View Full Definition

Rhenium (Re): Atomic number: 75, Atomic mass: 186.23 g.mol -1, Electronegativity: 1.9, Density: 20.5 g.cm-3 at 20°C, Melting point: 3170 °C, Boiling point: 5627 °C, Vanderwaals radius: 0.138 nm, Ionic rad . . . View Full Definition

Scandium (Sc): Atomic number: 21, Atomic mass: 44.9559 g.mol -1, Electronegativity: unknown, Density: 3.0 g.cm-3 at 20°C, Melting point: 1541 °C, Boiling point: 2836 °C, Vanderwaals radius: 0.161 nm, Ionic . . . View Full Definition

Silver (Ag): Atomic number: 47, Atomic mass: 107.87 g.mol -1, Electronegativity: 1.9, Density: 10.5 g.cm-3 at 20°C, Melting point: 962 °C, Boiling point: 2212 °C, Vanderwaals radius: 0.144 nm, Ionic radi . . . View Full Definition