Atom

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across. They are so small that accurately predicting their behavior using classical physics—as if they were tennis balls, for example—is not possible due to quantum effects.

Atomic theory

Atomic theory is the scientific theory that matter is composed of particles called atoms. Atomic theory traces its origins to an ancient philosophical tradition known as atomism. According to this idea, if one were to take a lump of matter and cut it into

Time constraint

In law, time constraints are placed on certain actions and filings in the interest of speedy justice, and additionally to prevent the evasion of the ends of justice by waiting until a matter is moot. The penalty for violating a legislative or court

Proton

A proton is a stable subatomic particle, symbol p, H+, or 1H+ with a positive electric charge of +1e elementary charge. Its mass is slightly less than that of a neutron and the proton-to-electron mass ratio makes it 1836 times the mass of an electron

Chemical element

In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by any chemical reaction. The

Sundman (crater)

Sundman is a lunar impact crater that lies just past the western limb of the Moon. Although it lies on the far side from the Earth, this part of the surface is brought into view during periods of favorable libration and illumination. Sundman lies to the

Timeline of scientific experiments

The timeline below shows the date of publication of major scientific experiments

790s

The 790s decade ran from January 1, 790, to December 31, 799

Principal quantum number

In quantum mechanics, the principal quantum number is one of four quantum numbers assigned to each electron in an atom to describe that electron's state. Its values are natural numbers making it a discrete variable

870s

The 870s decade ran from January 1, 870, to December 31, 879

France Bleu Pays de Savoie

France Bleu Pays de Savoie, sometimes referred to as France Bleu Savoie, is a generalist radio station based in Chambéry. The radio station serves the departments of Savoie and Haute-Savoie, though it can also be received as far as Geneva, Lyon, and in