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.
Definition of Fable. The word fable is derived from a Latin word â fibula â which means a story that is a derivative of a word â fari â which means to speak. Fable is a literary device which can be defined as a concise and brief story intended to provide a moral lesson at the end.In literature, it is described as a didactic lesson given through some sort of animal story.able is a literary device which can be defined as a concise and brief story intended to provide a moral lesson at the end. In literature, it is described as a didactic lesson given through some sort of animal story.