Valence Electrons
Valence Electrons Chapter 1 Section 1 Pages 4-7
Combining Atoms through Chemical Bonding • Properties of new substances are different from the original elements. • When chemical bonds are formed, valence electrons are shared, gained, or lost.
Electron Number and Organization • Atomic # = Number of Protons (+) = Number of electrons (-) – Therefore the atoms is neutral • Use energy levels to model arrangement of electrons • Only outermost electrons form bonds = valence electrons • Within in a group – atoms of each element have the same number of valence electrons
To Bond or Not to Bond The number of valence electrons determines whether the atoms will form bonds with other atoms. G18 – Noble Gases – do not usually form bonds – their outer level is full! When atoms form bonds, they do so by gaining, sharing, or losing to fill their outermost energy level. Exception to the octet rule – Hydrogen and Helium – they have only one energy level, therefore 2 valence electrons fill their outermost level.
Combining Atoms through Chemical Bonding • Properties of new substances are different from the original elements. • When chemical bonds are formed, valence electrons are shared, gained, or lost.
Electron Number and Organization • Atomic # = Number of Protons (+) = Number of electrons (-) – Therefore the atoms is neutral • Use energy levels to model arrangement of electrons • Only outermost electrons form bonds = valence electrons • Within in a group – atoms of each element have the same number of valence electrons
To Bond or Not to Bond The number of valence electrons determines whether the atoms will form bonds with other atoms. G18 – Noble Gases – do not usually form bonds – their outer level is full! When atoms form bonds, they do so by gaining, sharing, or losing to fill their outermost energy level. Exception to the octet rule – Hydrogen and Helium – they have only one energy level, therefore 2 valence electrons fill their outermost level.
