ELECTRON GROUPS IN
STABLE KERNELS.

He 2

Ne 2-8

A 2-8-8

Ni/3 2-8-18

Kr 2-8-18-8

Pd/3 2-8-18-18

Xe 2-8-18-18-8

Er/3 2-8-18-32-8

Pt/3 2-8-18-32-18

Nt 2-8-18-32-18-8

o

2

He

10

Ne

18

A

28

Ni/3

36

Kr

46

Pd/3

54

Xe

68

Er/3

78

Pt0

86

Nt

1

H

3

Li

11

Na

19

K

29

Cu

37

Rb

47

Ag

55

Cs

79

Au

87

PERIODS

4

Be

12

Mg

20

Ca

30

Zn

38

Sr

48

Cd

56

Ba

80

Hg

88

Ra

5

B

13

Al

21

Sc

31

Ga

39

Y

49

In

57

La

71

Lu

81

Tl

89

Ac

BUILT ON

6

C

14

Si

22

Ti

32

Ge

40

Zr

50

Sn

58

Ce

72

Hf

82

Pb

90

Th

7

N

15

P

23

V

33

As

41

Cb

51

Sb

59

Pr

73

Ta

83

Bi

91

Ux 2

STABLE KERNELS.

8

0

16

S

24

Cr

34

Se

42

Mo

52

Te

60

Nd

74

W

84

RaF

92

U

1

H

9

F

17

Cl

25

Mn

35

Br

43

53

I

61

75

85

2

He

10

Ne

18

A

26

Fe

36

Kr

•44

Ru

54

Xe

62

Sa

76

Os

86

Nt

27

Co

45

Rh

63

Eu

77

Ir

28

Ni

46

Pd

1

1

64

Gd

78

Pt

65

Tb

66

Ho

67

Dy

68

Er

69

Tm

70 1

Yb

Symbol enclosed in heavy lines —the kernel never acquires the form of an inert gas or a beta kernel

Symbol enclosed in light double lines — the kernel sometimes acquires the form of an inert gas or a beta kernel

Symbol enclosed in a light single line — the kernel is usually or invariably of the form of an inert gas or a beta kernel