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Any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups.

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Solubility Product Constant

Equilibrium constant that applies to the dissolution of a slightly soluble compound.

Dipole-dipole Interactions

Attractive interactions between polar molecules, that is, between molecules with permanent dipoles.

Theoretical Yield

Maximum amount of a specified product that could be obtained from specified amounts of reactants, assuming complete consumption of limiting reactant according to only one reaction and complete recovery of product.

Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Lewis Dot Formula (Electron Dot Formula)

Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.

Natural Radioactivity

Spontaneous decomposition of an atom.

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Resonance

The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.