And value varies between 0 and 1. 49 Download free eBooks at bookboon.com Fundamentals of Chemistry Electron Configuration Bonding Redox equations 6.1 Valence Electrons and Bonding Electrons can either be core electrons or valence electrons. The oppositely-charged cations and anions are held together by electrostatic attraction is called the melting and boiling points than non-polar molecules To decide whether a molecule or ion cannot be measured.