16 relations: Atom, Atomic units, Atto-, Attophysics, Electron, Femtosecond, Flash (comics), Half-life, Hydrogen, International System of Units, Isotopes of beryllium, Metric prefix, Names of large numbers, Orders of magnitude (time), Second, Triple-alpha process.

## Atom

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.

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## Atomic units

Atomic units (au or a.u.) form a system of natural units which is especially convenient for atomic physics calculations.

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## Atto-

Atto (symbol a) is a unit prefix in the metric system denoting a factor of 10−18 or.

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## Attophysics

Attophysics also known as attoscience is a branch of physics wherein attosecond (10−18 s) duration pulses of electrons or photons are used to probe dynamic processes in matter with unprecedented time resolution.

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## Electron

The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.

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## Femtosecond

A femtosecond is the SI unit of time equal to 10−15 or 1/1,000,000,000,000,000 of a second; that is, one quadrillionth, or one millionth of one billionth, of a second.

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## Flash (comics)

The Flash (or simply Flash) is the name of several superheroes appearing in comic books published by DC Comics.

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## Half-life

Half-life (symbol t1⁄2) is the time required for a quantity to reduce to half its initial value.

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## Hydrogen

Hydrogen is a chemical element with symbol H and atomic number 1.

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## International System of Units

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.

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## Isotopes of beryllium

Beryllium (4Be) has 12 known isotopes, but only one of these isotopes is stable and a primordial nuclide.

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## Metric prefix

A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit.

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## Names of large numbers

This article lists and discusses the usage and derivation of names of large numbers, together with their possible extensions.

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## Orders of magnitude (time)

An order of magnitude of time is (usually) a decimal prefix or decimal order-of-magnitude quantity together with a base unit of time, like a microsecond or a million years.

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## Second

The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.

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## Triple-alpha process

The triple-alpha process is a set of nuclear fusion reactions by which three helium-4 nuclei (alpha particles) are transformed into carbon.

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## Redirects here:

1 E -16 s, 1 E-16 s, 1 E-17 s, 1 E-18 s, 1e-18 s, Attasecond, Attosecond/version 2, Attoseconds.