ELECTRON ARRANGEMENT

Heisenberg Uncertainty Principle:

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GENERAL LOCATION  --------------------        ____________________

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V

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SPECIFIC LOCATION --------------------         ____________________

ENERGY LEVELS       - divisions of the electron cloud

- numbered consecutively from closest to farthest away from nucleus

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Electrons will occupy the location with the lowest amount of energy.

SUBLEVELS              - divisions of energy levels

- designated by letters (s, p, d, f)

- number of sublevels in an energy level = # of the energy level

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ORBITALS     - divisions of sublevels

- number of orbitals in an energy level =

-  “s”  sublevel has 1 orbital;   “p”  sublevel has 3 orbitals;   “d”  sublevel has 5 orbitals;
“f”  sublevel has 7 orbitals

HOW MANY ELECTRONS CAN AN ORBITAL HOLD?

HOW MANY ELECTRONS CAN EACH SUBLEVEL HOLD?    “s” = ___ e-            “p” = ___ e-            “d” = ___ e-                 “f” = ___ e-

HOW MANY ELECTRONS CAN AN ENERGY LEVEL HOLD?

AUFBAU PRINCIPLE –

What is the order in which the sublevels fill with electrons?                  Use the DIAGONAL RULE.

1s

2s     2p

3s     3p     3d

4s     4p     4d             4f

5s     5p     5d             5f

6s     6p     6d     6f

7s     7p