Show Menu
Cheatography

Electron Config­uration

Valance electrons
Number of electrons in outermost shell.
shell -> subshells -> orbitals
shell
K, L, M, N
n=1, 2, ...
subshell
s, p, d, f, g
1s, 2s, 2p, 3s, ...
orbital
s, px, py, pz
1s, 2s, 2px, 2py, 2pz
Element is classified as s, p, d and f block element
depending on the orbital filled by the last electron.

Quanti­tative Reasoning

Mole (Avaga­dro's constant)
It is a unit for telling the count, just like dozen.
1 mole = 6.02 x 1023 units
Standard Temper­ature and Pressure (STP)
Avagadro's Hypothesis
Volume occupied by 1 mole of ideal gas at STP is 22.41 litres
Mass of neutron
1.0087 u
Mass of proton
1.0073 u
Mass of electron
0.00055 u

Periodic Table Groups

Group 1
Alkali Metals
Valency +1
~ium
Group 2
Alkali Earth Metals
Valency +2
~ium
Group 17
Halogens
Valency -1
~ine
Group 18
Inert (Nobel) Gases
Valency 0
~on
Diatomic nonmetals
H, Halogens, C, and O
s-block
Group 1, 2
p-block
Group 13 to 18
d-block
Group 3 to 12
 

Group 1 (Alkali Metals): +1

Hydr­ogen (Excep­tion: Non-metal)
H
1 (atomic number)
1x=1 u or amu
Lith­ium
Li
3
2x+1=7
Sodium
Na
3+8=11
2x+1=23
Pota­ssium
K
11+8=19
2x+1=39
Rubidium
Rb
19+18=37
2x+11=85
Caesium
Cs
37+18=55
2x+23=133
Francium
Fr
55+32=87
2x+49=223

Group 2 (Alkali Earth Metals): +2

Bery­llium
Be
4
Magn­esium
Mg
4+8=12
Calc­ium
Ca
12+8=20
Strontium
Sr
20+18=38
Barium
Ba
38+18=56
Radium
Ra
56+32=88

Shell, Subshell and Orbital

Electron Config­uration - Filling Shells

Energy levels of Orbitals

 

Group 17 (Halog­ens): -1

Fluo­rine
F
9
Chlo­rine
Cl
9+8=17
Brom­ine
Br
17+18=35
Iodine
I
35+18=53
Astatine (Excep­tion: Metalloid)
At
53+32=85
Ununse­ptium (Artif­icial Element)
Uus
85+32=117

Group 18 (Inert or Noble Gases): 0

Helium
He
2
Neon
Ne
2+8=10
Argon
Ar
10+8=18
Kryp­ton
Kr
18+18=36
Xeon
Xe
36+18=54
Radon
Rn
54+32=86
Ununoctium
UUo
86+32=118

Help Us Go Positive!

We offset our carbon usage with Ecologi. Click the link below to help us!

We offset our carbon footprint via Ecologi
 

Comments

No comments yet. Add yours below!

Add a Comment

Your Comment

Please enter your name.

    Please enter your email address

      Please enter your Comment.