B. Covalent bond 1. D. Electron orbital the 3-D space where an electron spends most of its time. Only 2 electrons can occupy the same orbital at any time. First electron shell has 1 orbital, there are two electrons in the orbital, and two electrons in the first shell. E. Valence electrons 1.
Electrons present in outer orbital.
Know how many bonds an element will form. Know what the charge of an element will be when it ionizes. B. Hydrogen bonds form between water molecules and with other molecules that have polar bonds. Cohesion water molecules cling to each other . Due to H-bonding.