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An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

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Buret

A piece of volumetric glassware, usually graduated in 0.1-mL intervals, that is used to deliver solutions to be used in titrations in a quantitative (dropwise) manner.

Manometer

A two-armed barometer.

Metalloids

Elements with properties intermediate between metals and nonmetals: B, Al, Si, Ge, As, Sb, Te, Po, and At.

Molecular Orbital Theory

A theory of chemical bonding based upon the postulated existence of molecular orbitals.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.

Effective Molality

The sum of the molalities of all solute particles in a solution.

Moderator

A substance such as hydrogen, deuterium, oxygen or paraffin capable of slowing fast nuetrons upon collision.

Nernst Equation

Corrects standard electrode potentials for nonstandard conditions.

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.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."