4

Be

Group 2 Period 2

88

Ra

Group 2 Period 7

3

Li

Group 1 Period 2

87

Fr

Group 1 Period 7

11

Na

Group 1 Period 3

38

Sr

Group 2 Period 5

56

Ba

Group 2 Period 6

12

Mg

Group 2 Period 3

19

K

Group 1 Period 4

20

Ca

Group 2 Period 4

26

Fe

Group 8 Period 4

25

Mn

Group 7 Period 4

27

Co

Group 9 Period 4

29

Cu

Group 11 Period 4

28

Ni

Group 10 Period 4

22

Ti

Group 4 Period 4

30

Zn

Group 12 Period 4

24

Cr

Group 6 Period 4

48

Cd

Group 12 Period 5

47

Ag

Group 11 Period 5

92

U

Period 7

74

W

Group 6 Period 6

79

Au

Group 11 Period 6

13

Al

Group 13 Period 3

50

Sn

Group 14 Period 5

80

Hg

Group 12 Period 6

82

Pb

Group 14

Period 6

95

Am

Period 7

94

Pu

Period 7

2

He

Group 18 Period 1

9

F

Group 17 Period 2

Rn

86

Group 18 Period 6

18

Ar

Group 18 Period 3

53

I

Group 17 Period 5

36

Kr

Group 18 Period 4

17

Cl

Group 17 Period 3

54

Xe

Group 18 Period 5

35

Br

Group 17 Period 4

10

Ne

Group 18 Period 2

51

Sb

Group 15 Period 5

6

C

Group 14 Period 2

7

N

Group 15 Period 2

33

As

Group 15 Period 4

8

O

Group 16 Period 2

1

H

Group 1 Period 1

16

S

Group 16 Period 3

15

P

Group 15 Period 3

5

B

Group 13 Period 2

14

Si

Group 14 Period 3

18 columns

valence electrons

7 periods

Number of orbitals

By Rutherford

existence of the nucleus

1 amu

positive charge

nucleus

atomic number

neutral charge

nucleus

0 amu

negative charge

electron cloud

Average mass of isotopes

%abundance x mass + %abundance x mass + ...

Nucleus to the electron cloud.

decreases in size as you go across table, bc the increased # of protons pull on to the electrons

increase in size as you go down the table bc of increase in number of shells

Alkali Metals

most reactive and must be stored in kerostene

Alkaline Earth Metals

less reactive than group 1

Transition Metals

harder denser than alkali and good conductors

Halogens

very reactive

mainly gases

noble gases

unreactive

INNER TRANSITIONAL METALS

Lanthanides shiny and reactive

Actinides radioactive

Atomic Theory

All atoms are composed of p e and n.

All atoms of same element are identical.

Atoms of different elements are different.

Atoms of different elements can combine only in simple whole # ratios.

Father of Chem

Law of Consevation of Matter