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Symbol for an atom A/Z E, in which E is the symbol of an element, Z is its atomic number, and A is its mass number.

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Addition Reaction

A reaction in which two atoms or groups of atoms are added to a molecule, one on each side of a double or triple bond. Types of addition reaction include electrophilic, nucleophilic (polar) and free radical addition (non-polar).

Canal Ray

Stream of positively charged particles (cations) that moves toward the negative electrode in cathode ray tubes, observed to pass through canals in the negative electrode.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Ionization Energy

The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.

Alloying

Mixing of metal with other substances (usually other metals) to modify its properties.

xenon hexafluoride

A colorless, crystalline compound, XeF6, that melts at 50°C to a yellow liquid, and boils at 75°C.

Isomorphous

Refers to crystals having the same atomic arrangement.

Dynamic Equilibrium

An equilibrium in which processes occur continuously, with no net change. When two (or more) processes occur at the same rate so that no net change occurs.

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.