Discovered : at both Berkeley, California, USA, and Dubna, near Moscow, Russia in 1970. Description:A highly radioactive metal which does not occur naturally, and of which only a few atoms have ever been made. It is of research interest only. Origin:The element is named after the Russian town of Dubna.
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The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types. The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The...
The chemistry of substances that contain carbon-hydrogen bonds.
Allotropic Modifications (Allotropes)
Different forms of the same element in the same physical state.
Description of a chemical reaction by placing the formulas of the reactants on the left and the formulas of products on the right of an arrow.
A binary compound of hydrogen.
Reactions in which one element displaces another from a compound.
Regular periodic variations of properties of elements with atomic number (and position in the periodic table).
Either the oxidation part or the reduction part of a redox reaction.
Ideal Gas Law
The product of pressure and the volume of an ideal gas is directly proportional to the number of moles of the gas and the absolute temperature.
A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.
The energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity. In these processes a small amount of mass is converted to energy according to the relationship E = mc2, where E is energy, m is mass, and c is the speed of light.
An orbit resulting from overlap and mixing of atomic orbitals on different atoms. An MO belongs to the molecule as a whole.
A group of atoms derived from an alkane by the removal of one hydrogen atom.
Number of moles of solute per litre of solution.
Poor electric and heat conductor.
A salt or ester of salicylic acid.
Heat of Fusion
The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.
Third Law of Thermodynamics
The entropy of a hypothetical pure, perfect, crystalline sustance at absolute zero temperature is zero.
A series of compounds in which each member differs from the next by a specific number and kind of atoms.
An orgainic ion carrying a positive charge on a carbon atom.
High energy particles or rays emitted during the nuclear decay processes.