principal quantum number
101X-ray notation — is a method of labeling atomic orbitals that grew out of X ray science. It is still traditionally used with most x ray spectroscopy techniques including AES and XPS. In X ray notation, every principal quantum number is given a letter associated… …
102K-shell — /kay shel /, n. Physics. the first shell of electrons surrounding the nucleus of an atom and containing, when filled, two electrons having principal quantum number 1. Cf. L shell, M shell, N shell. [1965 70] * * * …
103L-shell — /el shel /, n. Physics. the second shell of electrons surrounding the nucleus of an atom and containing, when filled, eight electrons having principal quantum number 2. Cf. K shell, M shell, N shell. [1925 30] * * * …
104M-shell — /em shel /, n. Physics. the third shell of electrons surrounding the nucleus of an atom and containing, when filled, 18 electrons having principal quantum number three. Cf. K shell, L shell, N shell. [1920 25] * * * …
105N-shell — /en shel /, n. Physics. the fourth shell of electrons surrounding the nucleus of an atom and containing, when filled, 32 electrons having principal quantum number 4. Cf. K shell, L shell, M shell. [1920 25] * * * …
106Balmer series — noun The set of spectral lines of the hydrogen atom that correspond to transitions involving a principal quantum number n=2 …
107Double bond rule — The double bond rule states that chemical elements with a principal quantum number greater than 2 (e.g. Period 3 elements and lower) do not form multiple bonds (e.g. double bonds and triple bonds) with themselves or with other elements.[1] The… …
108shell — [[t]ʃɛl[/t]] n. 1) zool. a hard outer covering of an animal, as of a clam, snail, lobster, or turtle 2) zool. the material constituting any of various coverings of this kind 3) zool. the hard exterior of an egg 4) bot the usu. hard outer covering …
109Q-shell — The electron shell in an atom corresponding to a principal quantum number of seven. It is the outermost shell for heavy radioactive elements …
110shell — [shel] n. [ME schelle < OE sciel, akin to MDu schelle < IE base * (s)kel : see SHELF] 1. a hard outer covering, as of a turtle, mollusk, insect, egg, fruit, seed, etc. 2. something like or suggestive of a shell in being hollow, empty, or… …
