Chemical element whole number. For example, the relative atomic mass of chlorine is 35.453 u, which differs greatly from a whole number as it is an average of about 76% chlorine-35 and 24% chlorine-37. Whenever a relative atomic mass value differs by more than 1% from a whole number, it is due to this averaging effect, as significant amounts of more than one isotope are naturally present in a sample of that element. Chemists and nuclear scientists have different definitions of a "pure element". In chemistry, a pure element means a substance whose atoms all (or in practice almost all) have the
Greek name name James is a derivative of Ἰάκωβος/ Iakovos. Greek family names are most commonly patronymics but may also be based on occupation, personal characteristics or location. The [[feminine gender|feminine]] version is usually the [[genitive case|genitive]] of the family name of the woman's father or husband; so, for example, Mr. Yannatos and Mrs. [[Savina Yannatou|Yannatou]]. As a result of their codification in the Modern Greek state, surnames have [[Katharevousa]] forms even though Katharevousa is no longer the official standard. Thus, the Ancient Greek name Eleutherios forms the Modern Greek proper name Lefteris. In the past, people in speaking used the family