Atoms, Molecules & Elements CC4505© 55

Atomic Models

Hyd

rog

en

He

lium

Lith

ium

Be

rylli

um

Bo

ron

Ca

rbo

nN

itro

ge

nO

xyg

en

Fluo

rine

Ne

on

..................2

prot

ons

+2 n

eutro

ns3

prot

ons

+4 n

eutro

ns4

prot

ons

+5 n

eutro

ns+1

neu

trons

5 pr

oton

s+6

neu

trons

6 pr

oton

s+6

neu

trons

7 pr

oton

s+7

neu

trons

8 pr

oton

s+8

neu

trons

9 pr

oton

s+1

0 ne

utro

ns10

pro

tons

+10

neut

rons

Atoms, Molecules & Elements CC4505© 56

History of the Atomic Model

Dalton1803

Thompson1897

Rutherford1909

Bohr1913

Current electron cloud model proposed in1926.

Dalton’s atom Thomson’s plum-pudding atom Rutherford’s atom

Bohr’s planetary atom

Current orbital atom

Electron clouds

...........................

Atoms, Molecules & Elements CC4505© 57

Elements and Compounds

SALT BAKING SODA

SUGAR

OXYGEN

...........................

Atoms, Molecules & Elements CC4505© 58

Me

nd

ele

ev

Me

nd

ele

ev’

s Pe

riod

ic Ta

ble

Gro

up

III

III

IVV

VI

VII

VII

IPe

riod 1

H=1

2L

i=7

Be=

9.4

B=1

1C

=12

N=1

4O

=16

F=1

9

3N

a=23

Mg=

24A

I=27

.3Si

=28

P=3

1S=

32C

I=35

.5

4K

=39

Ca=

40?=

44T

i=48

V=5

1C

r=52

Mn=

55F

e=56

, Co=

59N

i=59

5C

u=63

Zn=

65?=

68?=

72A

s=75

Se=7

8B

r=80

6R

b=85

Sr=8

7?Y

t=88

Zr=

90N

b=94

Mo=

96?=

100

Ru=

104,

R

h=10

4P

d=10

6

7A

g=10

8C

d=11

2In

=113

Sn=1

18Sb

=122

Te=1

25J=

127

8C

s=13

3B

a=13

7?D

i=13

8?C

e=14

0

9 10?E

r=17

8?L

a=18

0Ta

=182

W=1

84O

=195

, h=1

97P

t=19

8

11A

u=19

9H

g=20

0T

I=20

4P

b=20

7B

i=20

8

12T

h=23

1U

=240

Mendeleev’s Periodic Table...........................

Atoms, Molecules & Elements CC4505© 59

...................The Periodic Table

Atoms, Molecules & Elements CC4505© 60

The Periodic Table(Showing the Elements)

.....................