ELECTRON DISTURBUTION MNEMONICS

HOW ARE ELECTRONS ARRANGED?

Electrons tend to arrange themselves around the nuclei so that they will have the lowest possible energy. They would all like to get into the lowest energy level, sometimes called the K-shell, but are prevented from doing, so by some rules that pop up in quantum mechanics. You can see how electrons are arranged in a particular atom by taking a look at the Periodic Table of Elements. There will always be one electron for each proton, they are positioned in layers called shells.

WHAT? WHAT? WHAT? 

orbitals: pathway of electrons. And where it could be found.
Shells: can only contain a fixed no. Of electrons each shell is associared with a particular range of electron energy and thus each shell must fill completely before electrons can be added to an outer shell.
Energy levels: determines the capacity or no. Of electrons each shell could contain

                                                           

                                                          N= Energy Level

Formula to determine the energy level of electrons

N=2

N=3

                                    2n²

    1st  energy level = 2x1²=2

N=1

            2^nd energy level = 2x2²=8

            3^rd energy level = 2x3²=18

            4^th energy level = 2x4²=32

·         Valence electrons found in the outmost shell

            5^th energy level = 2x5²=50

            6^th energy level = 2x6²=72

32

18

8

2

                                                                     

LET'S TRY SOME EXERCISES! 

Give the electron configuration of the ff:
Ex:
1. Li
Protons:3
Atomic Mass: 7
Neutrons: 4
Electron Configuration: 1s², 2s1


1. Calcium
Protons
Atomic Mass:
Neutrons:
Electron Configuration:

2. Manganese
Protons
Atomic mass:
Neutrons:
Electrons Configuration:

3. Zn
Protons:
Atomic Mass:
Neutrons:
Electron Configurations:

4. Sb
Protons:
Atomic Mass:
Neutrons:
Electron Configuration:

5. I
Protons:
Atomic Mass:
Neutrons:
Electron configuration:

MEMBERS: 

RACADIO

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