Atomic Number of Molybdenum. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. The chemical symbol for Molybdenum is Mo. Atomic Mass of Molybdenum. Atomic mass of Molybdenum is 95.94 u.
Definition of elective. 1  1a : chosen or filled by popular election an elective officialb : of or relating to electionc : based on the right or principle of election the presidency is an elective office. 2  2a : permitting a choice : optional an elective course in schoolb : beneficial to the patient but not essential for survival elective surgery.
Elective courses are classes that a student can take which are not specifically required to graduate or to fulfill a degree. They are generally seen as the opposite of core requirements, which are classes that all students must take unless they have special dispensation.