Atomic Theory

Page
6

Slide 77

Neon

Inert Gas

Noble Gas

Slide 78

Atom H He Li Be

Shells 1S 2S 2P 3S

Slide 79

Atom B C N O

Shells 1S 2S 2P 3S

Slide 80

Atom F Ne

Shells 1S 2S 2P 3S

Slide 81

Atom Na Mg Al Si

Shells 1S 2S 2P 3S

?

Slide 82

Valence Electrons

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

1 2 3 4 5 6 7 8

The number of electrons in the outside shell.

------------------------

Slide 83

H

1 +1

Atomic number

(number of protons)

Charge

1.008

average

Atomic

weight

Slide 84

H

2 1 +1

Atomic number

(number of protons)

Charge

(exact)

Atomic

weight

Slide 85

F

9 -1

Atomic number

(number of protons)

Charge

18.998

average

Atomic

weight

Slide 86

Isotopes

1H 2H 3H

Slide 87

H H

Isotopes

Atoms of the same element

(same number of protons) with a different number of neutrons.

Slide 88

C

12 6

C

13 6

Cuanto Neutrons tienen ?

Slide 89

12C 13C

6 protons 6 protons

6 Neutrons 7 Neutrons

Isotopes

Slide 90

C

12 6

C

13 6

3 2 1

3 2 1

Legend

Proton

Neutron

Electron

Isotopes

Slide 91

Slide 92

The rules:

The 1S orbital fills first

1S , 2S , 2P , 3S , 3P

S only holds 2

P only holds 6

Slide 93

Slide 94