Electron Configuration SC3b. Use the orbital configuration of neutral atoms to EXPLAIN its effect on the atom’s chemical properties.

Electron Configuration The arrangement of electrons in atoms Each element has a different # of electrons so the electron configuration is distinct for each element. Electrons tend to make arrangement to obtain the lowest possible energy (Ground State)

Orbital Diagram E-Configuration An occupied orbital is a line _____ One electron is represented by an up arrow, ↑ 2 electrons are represented by 2 arrows, ↑↓ Below the line, place the principal quantum number and the sublevel.

Principle Quantum Number The main energy level of an atom Equal to the period # 1s__ 2s__ 2p__ __ __ 3s__ 3p __ __ __ 3d __ __ __ __ __ The principle quantum numbers are 1, 2, and 3.

SUBLEVELS Sublevel # Orbitals # Electrons S 1 2 P 3 6 D 5 10 F 7 14

Orbital Diagram Practice Write the orbital diagram for the following elements… Example 1) Hydrogen Example 2) Helium Example 3) Lithium Example 4) Beryllium Example 5) Boron Example 6) Carbon Example 7) Nitrogen Example 8) Oxygen Example 9 Fluorine Example 10) Neon