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Given a measurable space (,) and a measure on that space, a set in is called an atom if > and for any measurable subset , either () = or () = (). [ 1 ] The equivalence class of A {\displaystyle A} is defined by [ A ] := { B ∈ Σ : μ ( A Δ B ) = 0 } , {\displaystyle [A]:=\{B\in \Sigma :\mu (A\Delta B)=0\},} where Δ {\displaystyle \Delta ...
Richard John Uniacke Richard John Uniacke by Robert Field Born (1753-11-22) November 22, 1753 Castletown, Kingdom of Ireland Died October 11, 1830 (1830-10-11) (aged 76) Mount Uniacke, Nova Scotia Richard John Uniacke (November 22, 1753 – October 11, 1830) was an abolitionist, lawyer, politician, member of the Nova Scotia House of Assembly and Attorney General of Nova Scotia. According to ...
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 .
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 ]
South Uniacke, Nova Scotia, small community in Hants County, Nova Scotia, Canada; Uniacke Square, public housing residential area in the north central area of Halifax, Nova Scotia; Uniacke Estate Museum Park, centred on the home of Richard John Uniacke at Mount Uniacke; Mount Uniacke, Co Cork, small community Co Cork, Ireland.
If an atom has more electrons than protons, then it has an overall negative charge and is called a negative ion (or anion). Conversely, if it has more protons than electrons, it has a positive charge and is called a positive ion (or cation). The electrons of an atom are attracted to the protons in an atomic nucleus by the electromagnetic force.
A comparison of the potential in a hydrogen atom with that in a Rydberg state of a different atom. A large core polarizability has been used in order to make the effect clear. The black curve is the Coulombic 1/r potential of the hydrogen atom while the dashed red curve includes the 1/r 4 term due to polarization of the ion core.
In it, Asimov presents the atom and subatomic particles in a historical context, beginning with Democritus's original thought experiments and theory of atomism, and ending with then-current knowledge of the fundamental particles. [1]