Presentation on theme: "Electron Configuration"— Presentation transcript:
1 Electron Configuration What is it?A list of orbitals that contain electrons for an element.Ex. 1s22s22p63s1What are the different ways:Orbital notation _______1sComplete configuration 1s22s22p63s1Abbreviated configuration(noble gas configuration) [He] 2s2
6 Rules of Electron Configuration 1. Afbau principleAn electron occupies the lowest energy orbital that can receive it.2. Pauli exclusion principleNo two electrons in the same atom can have the same four quantum numbers.3. Hund’s ruleOrbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron and all electrons in singly occupied orbitals must have the same spin state.
7 Notations Orbital Notation- Electron Configuration Notation An unoccupied orbital is represented by ____An orbital containing one electron is represented by ______1sAn orbital containing two electrons is represented by _______Electron Configuration Notation1s2 2s2 2p6
9 Steps 1. determine the number of electrons to be “addressed”. 2. Look at the template or periodic table and “count”3. You must fill “up” arrows in the orbitals before filling “down” arrows.4. The order of filling is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p (these are lowest energy to highest)
10 Blocks on the periodic table Can you find a pattern
12 Additional items Isoelectric Outer shell configuration Diamagnetic When these atoms lose or gain electrons, they would have the same number of electrons.Outer shell configurationValence electrons orbitals and placementDiamagneticWhen all of the electrons in orbitals are paired (up spin and down spin). If one is unpaired it is called paramagnetic)
14 Quantum model of the atom Quantum theory of an atomA theory that uses mathematical equations to describe wave properties of electrons and other small particles.Quantum NumbersThese numbers completely describe orbitals.
15 Quantum numbers 4 sets of numbers house #, street, city, zip code area code, prefix, number, extension1. Principal quantum number2. Angular momentum quantum number3. magnetic quantum number4. spin quantum number
16 Principal Quantum Number Symbolized by nIndicates the energy level of the electronAs n increases the electron’s energy and its distance from the nucleus increase.1-7
17 Angular Momentum Quantum Number Symbolized by lIndicates the shape of the orbital in a specific energy level.l = n-1For l=0, s orbital (spherical)For l=1, p orbital (dumbbell)For l=2, d orbitalFor l=3, f orbital
18 Magnetic Quantum Number Symbolized by mM numbers are whole, including 0 from –l to +l.Indicates the orientation of an orbital around the nucleus.S has only 1 possible orientationP has 3 orientationsD has 5 orientationsF has 7 orientations
19 Spin Quantum Number Values are +1/2 and -1/2 Indicates direction of spin2 electrons that are occupying the same orbital have to have opposite spins.