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Whereas a hydrogen atom moves at 1,600 m/s at room temperature and a nitrogen atom moves at 510 m/s, a caesium atom moves at a much slower speed of 130 m/s due to its greater mass. [ 65 ] [ 10 ] The hyperfine frequency of caesium (~9.19 GHz) is also higher than other elements such as rubidium (~6.8 GHz) and hydrogen (~1.4 GHz). [ 10 ]
Philosophical atomism is a reductive argument, proposing not only that everything is composed of atoms and void, but that nothing they compose really exists: the only things that really exist are atoms ricocheting off each other mechanistically in an otherwise empty void.
Richard Gordon FitzGerald Uniacke, FRSAI (19 August 1867 – 11 November 1934) [1] was a British genealogist and librarian. He was the eldest son of the Rev. Robert FitzGerald Uniacke, late vicar of Tandridge, Surrey , a descendant of an old Irish family, the Uniackes of Uniacke and Castleton, County Cork. [ 2 ]
The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic "cloud" of electrons. Atomic theory is the scientific theory that matter is composed of particles called atoms. The definition of the word "atom" has changed over the years in response to scientific discoveries.
Richard Uniacke may refer to: Richard John Uniacke (1753–1830), abolitionist, lawyer, politician, member of the Nova Scotia House of Assembly and Attorney General of Nova Scotia; Richard John Uniacke Jr. (1789–1834), lawyer, judge and political figure in Nova Scotia; Richard G. F. Uniacke (1867–1934), British genealogist and librarian
In the mathematical field of order theory, an element a of a partially ordered set with least element 0 is an atom if 0 < a and there is no x such that 0 < x < a. Equivalently, one may define an atom to be an element that is minimal among the non-zero elements, or alternatively an element that covers the least element 0 .
This was in a gold atom known to be 10 −10 metres or so in radius—a very surprising finding, as it implied a strong central charge less than 1/3000th of the diameter of the atom. The Rutherford model served to concentrate a great deal of the atom's charge and mass to a very small core, but did not attribute any structure to the remaining ...
Atomic spies or atom spies were people in the United States, the United Kingdom, and Canada who are known to have illicitly given information about nuclear weapons production or design to the Soviet Union during World War II and the early Cold War. Exactly what was given, and whether everyone on the list gave it, are still matters of some ...