1. PeRiOdIc TaBlE of ElEmEnTs
History

2. TiMe LiNe
1860’s
1869
1817
1863
1913

3. 1817 Triad Johann Dobereiner developed the triad.
Elements arranged in groups of 3.
Property similarities.

4. 1863 Octate Law John Newlands proposed the Law of the Octates.
Same properties are repeated every 8 elements.
Arrangement in increasing atomic mass.

5. 1869 Periods Mendeleev ordered the elements like newlands.
Properties’ periodicity.
Predicted elements (Al, B, Si, Ga, Sc and Ge)

6. 1860’s Periodic Law
Mendeleev and Meyer made an 8 column table.
Mendeleev said that all the elements in the same column have similar characteristics.
Periodic law: Properties of the elements are a periodic fuction of their “A”.

7. Moseley discovered the atomic number.
New Periodic Law: The properties of the elements are a periodic function of their atomic numbers.

8. AI s1 AII s2 AIII p1 AIV p2 AV p3 AVI p4 AVII p5 AVIII p6 GROUPS
Are the elements in the same column.
Same amount of electrons in the last level, different amount of levels (n).
Element H Li Na K Rb Cs Fr
NG Config
1s1
[He2]
2s1
[Ne10]
3s1
[Ar18]
4s1
[Kr36]
5s1
[Xe54]
6s1
[Rn86]
7s1
AI s1
AII s2
AIII p1
AIV p2
AV p3
AVI p4
AVII p5
AVIII p6

9. PERIODS Are the elements in the same Row.
Different amount of electrons in the last level, Same amount of levels (n).
Element Na Mg Al Si P S Cl Ar
NG Config
[Ne10]
3s1
3s2
3p1
3p2
3p3
3p4
3p5
3p6

10. Periodic Table of Elements1 18 IA
VIIIA 2 13 14 15 16 17 H
IIA
IIIA
IVA VA
VIA
VIIA He 3 4 5 6 7 8 9 10 Li Be B C N O F Ne 11 12 Na Mg
IIIB
IVB VB
VIB
VIIB
VIIIB IB
IIB Al Si P S Cl Ar 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 87 88 89
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118 Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Rg
Uub
Uut
Uuq
Uup
Uuh
Uus
Uuo 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 90 91 92 93 94 95 96 97 98 99
100
101
102
103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr S P D F

11. Exercises
For the element “X” with an electronic configuration that ends with: 4p4
Give the symbol
Give the group and period
Draw the lewis and bohr model
Give the electronic configuration, Group and Period of the following elements: Ba,V, In, Sn, Kr, At, Gd, He

13. Families Elements with the same characteristics and behavior.
Normally a family is a group.
Metals and non-metals have various families.