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A salt containing an ionizable hydrogen atom. Acidic salt does not necessarily produce acidic solutions.

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Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Atomic Number


Integral number of protons in the nucleus, defines the identity of element.
 

Nonelectrolyte

A substance whose aqueous solutions do not conduct electricity.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Bronsted-Lowry Base

A proton acceptor

Heteronuclear

Consisting of different elements.

Weak Field Ligand

A Ligand that exerts a weak crystal or ligand field and ge- nerally forms high spin complexes with metals.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

yttrium

A rare trivalent metallic element, found in gadolinite and other minerals. Symbol: Y, at. wt.: 88.905, at. no.: 39, sp. gr.: 4.47. Cf."rare-earth element."

Yttrium has a silver-metallic luster and is relatively stable in air unless finely divided. Turnings of the metal, however, ignite in air if their temperature exceeds 400oC. Yttrium oxide is one of the most important compounds of yttrium and accounts for the largest use. It is widely used in making YVO4 europium, and Y2O3 europium phosphors to give the red color in color television tubes.