Valence electrons. 1  The highest principal shell of an atom, in which there is at least one electron, is called the valence shell. 2  The electrons on the valence shell are called valence electrons. 3  Main group elements can hold a maximum of eight electrons in their valence shell. A full valence shell is known as an octet.
Novella. A novella is a written, fictional, prose narrative normally longer than a short story but shorter than a novel. The English word novella derives from the Italian word novella, feminine of novello, which means new. The novella is a common literary genre in several European languages.
digest - a periodical that summarizes the news. pictorial - a periodical (magazine or newspaper) containing many pictures. serial publication, serial, series - a periodical that appears at scheduled times. organ - a periodical that is published by a special interest group; the organ of the communist party. issue, number - one of a series published periodically; she found an old issue of the magazine in her dentist's waiting room. journal - a periodical dedicated to a particular subject; he reads the medical journals. review - a periodical that publishes critical essays on current affairs or literature or art.