The number of electrons in the outermost energy level of a molybdenum atom is one. The electrons in the outermost energy level or shell determine the chemical properties of an atom.
Molybdenum is a chemical element with the symbol Mo and atomic number 42. Its electronic configuration is [Kr] 4d5 5s1 and electrons per energy level is 2,8,18,13,1. The arrangement of electrons in an atom in different energy levels and sub-levels is called electronic configuration, and it's the basis of the modern periodic table. Molybdenum is classified as a transition metal, and it's located in group 6 and period 5 of the periodic table.