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Abbé Georges Édouard Lemaître

Overview page. Subjects: Astronomy and Astrophysics.

(1894–1966) Belgian astronomer and cosmologist

Lemaître was born at Charleroi in Belgium. After serving in World War I, he studied at the University of Louvain in Belgium from...

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Abdus Salam

Overview page. Subjects: Science and Mathematics.

(1926–1996)

Pakistani physicist who, with Sheldon Glashow and Steven Weinberg, was awarded the 1979 Nobel Prize for Physics for their unification of the weak and electromagnetic...

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atomic number

Overview page. Subjects: Earth Sciences and Geography.

Symbol Z. The number of protons in the nucleus of an atom. The atomic number is equal to the number of electrons orbiting the nucleus in a neutral atom.

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atomic weight

Overview page. Subjects: Science and Mathematics.

The weighted mean of the masses of the neutral atoms of an element expressed in atomic weight units.

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Aufbau principle

Overview page. Subjects: Chemistry.

A principle that gives the order in which orbitals are filled in successive elements in the periodic table. The order of filling is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6pnull...

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bound state

Overview page. Subjects: Chemistry — Physics.

A system in which two (or more) parts are bound together in such a way that energy is required to split them. An example of a bound state is a molecule formed from two (or more) atoms.

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charge

Overview page. Subjects: Chemistry — Physics.

A property of some elementary particles that gives rise to an interaction between them and consequently to the host of material phenomena described as electrical. Charge occurs in nature in...

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charm

Overview page. Subjects: Physics.

A property of certain elementary particles that is expressed as a quantum number (see atom) and is used in the quark model. It was suggested to account for the unusually long lifetime of...

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chemical equivalent

Overview page. Subjects: Chemistry.

The combining proportion of a substance, by mass, relative to a hydrogen standard. The chemical equivalent of an element is the number of grams of that element that will combine with or...

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configuration

Overview page. Subjects: Chemistry.

1 The arrangement of atoms or groups in a molecule.

2 The arrangement of electrons about the nucleus of an atom.

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