Electron Configurations - PowerPoint PPT Presentation

Loading...

PPT – Electron Configurations PowerPoint presentation | free to view - id: 6ef27e-OGRlM



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Electron Configurations

Description:

Electron Configurations 1926 further refined Bohr s model of the atom by developing the quantum mechanical model New Model of the Atom Comparison to Bohr s ... – PowerPoint PPT presentation

Number of Views:77
Avg rating:3.0/5.0
Slides: 23
Provided by: kwe50
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Electron Configurations


1
Electron Configurations
2
New Model of the Atom
  • 1926 further refined Bohrs model of the atom
    by developing the quantum mechanical model

3
Comparison to Bohrs Model
Electrons in levels Level Max e- 1 2
2 8 3 18 P and n0 in
nucleus
Gives probability of finding an electron in an
area Levels are broken into sublevels
Defines exact location of electron
4
Electron Configurations
  • Electron configuration the arrangement of
    electrons in levels and sublevels
  • There are 4 sublevels s p d and f.
  • Each sublevel can be further broken down into
    orbitals that each hold 2 electrons.

5
Electron Configuration Rules
  • There are 3 rules that explain how electrons
    occupy levels, sublevels, and orbitals.
  • Aufbau principle
  • Pauli exclusion principle
  • Hunds rule

6
Aufbau Principle
  • An electron occupies the lowest-energy sublevel
    that can receive it.

7
How to Remember Order
8
How to Use Periodic Table
  • Start at top left of periodic table.
  • Work your way left to right.
  • As you finish a row, move down.
  • Remember the d sublevels number is one behind
    the period.
  • Remember the f sublevels number is two behind
    the period.
  • 4f follows 6s and 5f follows 7s.

9
How to Use Periodic Table, continued
  • Write the level and sublevel filled followed by a
    superscript to indicate the number of electrons
    in that sublevel.
  • s holds maximum of 2
  • p holds maximum of 6
  • d holds maximum of 10
  • f holds maximum of 14

10
Electron Configurations
  • 3d7

Number of electrons in the sublevel
Energy Level
Sublevel
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2
4f14 etc.
11
OVERLAPSWhy are d and f orbitals always in lower
energy levels?
  • d and f orbitals require LARGE amounts of energy
    to create.
  • According to the Aufbau principle we must skip a
    sublevel that requires a large amount of energy
    (d and f orbtials) for one in a higher level but
    lower energy
  • FOLLOW THE PERIODIC TABLE IN ORDER!

12
Lets Try It!
  • Write the electron configuration for the
    following elements
  • H
  • Li
  • N
  • Ne
  • K
  • Zn
  • Pb

13
Lets Try It!
  • Write the electron configuration for the
    following elements
  • H 1s1
  • Li 1s2 2s1
  • N 1s2 2s2 2p3
  • Ne 1s2 2s2 2p6
  • K 1s2 2s2 2p6 3s2 3p6 4s1
  • Zn 1s2 2s2 2p6 3s2 3p6 4s2 3d10
  • Pb 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6
    6s2 4f14 5d10 6p2

14
YOU TRY THESE!
  • Write the electron configuration for the
    following elements
  • He
  • Mg
  • O
  • P
  • S
  • Fe
  • Ag

15
YOU TRY THESE! Answers
  • Write the electron configuration for the
    following elements
  • He 1s2
  • Mg 1s2 2s2 2p6 3s2
  • O 1s2 2s2 2p4
  • P 1s2 2s2 2p6 3s2 3p3
  • S 1s2 2s2 2p6 3s2 3p4
  • Fe 1s2 2s2 2p6 3s2 3p6 4s2 3d6
  • Ag 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d9

16
Noble Gas Notation
  • A way of abbreviating long electron
    configurations
  • Since we are only concerned about the outermost
    electrons, we can skip to places we know are
    completely full (noble gases), and then finish
    the configuration

17
Noble Gas Notation
  • Step 1 Find the closest noble gas to the atom,
    WITHOUT GOING OVER the number of electrons in the
    atom. Write the noble gas in brackets .
  • Step 2 Find where to resume by finding the next
    energy level (row in periodic table).
  • Step 3 Resume the configuration starting with
    ns2 where n is the next level

18
Noble Gas Notation
  • Chlorine
  • Longhand is 1s2 2s2 2p6 3s2 3p5
  • You can abbreviate the first 10 electrons with a
    noble gas, Neon. Ne replaces 1s2 2s2 2p6
  • The next energy level after Neon is 3
  • So you start at level 3 on the periodic table and
    continue with 3s and 3p until you arrive at
    chlorine.
  • Ne 3s2 3p5

19
Practice Noble Gas Notation
  • Write the noble gas notation for each of the
    following atoms
  • Cl
  • K
  • Ca
  • I
  • Bi

20
Practice Noble Gas Notation
  • Write the noble gas notation for each of the
    following atoms
  • Cl Ne3s2 3p5
  • K Ar4s1
  • Ca Ar4s2
  • I Kr5s2 4d10 5p5
  • Bi Xe6s2 4f14 5d10 6p3

21
You Try These
  • Write the noble gas notation for each of the
    following atoms.
  • He
  • Mg
  • O
  • P
  • S
  • Fe
  • Ag

22
You Try These
  • Write the noble gas notation for each of the
    following atoms.
  • He 1s2
  • Mg Ne 3s2
  • O He 2s2 2p4
  • P Ne 3s2 3p3
  • S Ne 3s2 3p4
  • Fe Ar 4s2 3d6
  • Ag Kr 5s2 4d9
About PowerShow.com