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.
Novella: 20,000 to 50,000 - A story can be written in any of the other genres, but if its word count falls within these parameters it is usually classified as a novella. Non-Fiction: 70,000 to 110,000 - Covering a broad range of topics still sees little variation in the size of published books.