Science / Periodic Table of Elements Glossary

Oxygen (O): Atomic number: 8, Atomic mass: 15.999 g.mol -1, Electronegativity: 3.5, Density: 1.429 kg/m3 at 20°C, Melting point: -219 °C, Boiling point: -183 °C, Vanderwaals radius: 0.074 nm, Ionic radi . . . View Full Definition

Palladium (Pd): Atomic number: 46, Atomic mass: 106.42 g.mol -1, Electronegativity: 2.2, Density: 11.9 g.cm-3 at 20°C, Melting point: 1560 °C, Boiling point: 2927 °C, Isotopes: 9, Vanderwaals radius: 0.065 . . . View Full Definition

Period: Rows in the periodic table are called periods. For example, all of the elements in the second row are referred to as 'second period elements'. All elements currently known fall in the first . . . View Full Definition

Periodic Law: The periodic law states that physical and chemical properties of the elements recur in a regular way when the elements are arranged in order of increasing atomic number.

Periodic Table: An arrangement of the elements according to increasing atomic number that shows relationships between element properties.

Periodic Trend: A regular variation in element properties with increasing atomic number that is ultimately due to regular variations in atomic structure.

Phosphorus (P): Atomic number: 15, Atomic mass: 30,9738 g.mol -1, Oxidation states: ± 3, 4, 5, Electronegativity: 2,1, Density: 1,82 g/ml at 20°C, Melting point: 44,2 °C, Boiling point: 280 °C, Vanderwaals . . . View Full Definition

Platinum (Pt): Atomic number: 78, Atomic mass: 195.09 g.mol -1, Electronegativity: 2.2, Density: 21.4 g.cm-3 at 20°C, Melting point: 1772 °C, Boiling point: 3800 °C, Vanderwaals radius: 0.138 nm, Ionic rad . . . View Full Definition

Plutonium (Pu): Atomic number: 94, Atomic mass: (244) g.mol -1, Electronegativity: unknown, Density: 19.84 g.cm-3 at 20°C, Melting point: 641 °C, Boiling point: 3232 °C, Vanderwaals radius: unknown, Ionic r . . . View Full Definition

Polonium (Po): Atomic number: 84, Atomic mass: (210) g.mol -1, Electronegativity: 2.0, Density: 9.51 g.cm-3 at 20°C, Melting point: 254 °C, Boiling point: 962 °C, Vanderwaals radius: 0.164 nm, Ionic radius . . . View Full Definition

Potassium (K): Atomic number: 19, Atomic mass: 39.0983 g.mol -1, Electronegativity: 0.8, Density: 0.86 g.cm -3 at 0 °C, Melting point: 63.2 °C, Boiling point: 760 °C, Vanderwaals radius: 0.235 nm, Ionic ra . . . View Full Definition

Praseodymium (Pr): Atomic number: 59 , Atomic mass: 140.91 g.mol -1, Electronegativity: 1.1, Density: 6.8 g.cm-3 at 20°C, Melting point: 931 °C, Boiling point: 3512 °C, Vanderwaals radius: unknown, Ionic radiu . . . View Full Definition

Promethium (Pm): Atomic number: 61, Atomic mass: (147) g.mol -1, Electronegativity: unknown, Density: 6.475 g.cm-3 at 20°C, Melting point: 1168 °C, Boiling point: 2460 °C, Vanderwaals radius: unknown, Ionic . . . View Full Definition

Protactinium (Pa): Atomic number: 91, Atomic mass: 231.0359 g.mol -1, Electronegativity: 1.5, Density: 15.37 g.cm-3 at 20°C, Melting point: 1600 °C, Boiling point: unknown, Vanderwaals radius: unknown, Ionic r . . . 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

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

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

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

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