دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

radioactive decay process where the loss of an alpha particle from the nucleus lowers the atomic number by two and the atomic mass by four.

n: a number that expresses the number of protons and an equal number of electrons in each atom of an element.

n: a form of an element that has the same atomic number as its other forms 1:MJt has a different atomic mass. Isotopes of an element have the same number of protons 1:MJt different numbers of neutrons in the nucleus.

one of several forms of an element, all having the same number of protons but differing in the number of neutrons.

n: one of the alkali metal elements with a valence of 1 and an atomic weight of about 39. Potassium compounds, most commonly potassium hydroxide (KOH),are sometimes added to drilling fluids to impart special properties, usually inhibition.

n: An element with an atomic number of 19. The 40K isotope is radioactive, decaying with the emission of a single gamma ray of 1.46 MeV with a half-life of 1.3 * 109 years to give a stable isotope of argon. Potassium is the largest source of natural radioact

n: (Na) one of the alkali metal elements with a valence of 1, an atomic number of about 23. Numerous sodium compounds are used as additives to drilling fluids.