Electron Groups 
=========================

1: 1

2: 18

3: 1

4: 2

5: 13

6: 14

7: 15

8: 16

9: 17

10: 18

11: 1

12: 2

13: 13

14: 14

15: 15

16: 16

17: 17

18: 18

19: 1

20: 2

21: 3

22: 4

23: 5

24: 6

25: 7

26: 8
27: 9

28: 10

29: 11

30: 12

31: 13

32: 14

33: 15

34: 16

35: 17

36: 18

37: 1

38: 2

39: 3

40: 4

41: 5

42: 6

43: 7

44: 8

45: 9

46: 10

47: 11

48: 12

49: 13

50: 14

51: 15

52: 16

53: 17

54: 18

55: 1

56: 2

57: 3

58: lanthanoid

59: lanthanoid

60: lanthanoid

61: lanthanoid

62: lanthanoid

63: lanthanoid

64: lanthanoid

65: lanthanoid

66: lanthanoid

67: lanthanoid

68: lanthanoid

69: lanthanoid

70: lanthanoid

71: lanthanoid

72: 4

73: 5

74: 6

75: 7

76: 8

77: 9

78: 10

79: 11

80: 12

81: 13

82: 14

83: 15

84: 16

85: 17

86: 18

87: 1

88: 2

89: 3

90: actinoid

91: actinoid

92: actinoid

93: actinoid

94: actinoid

95: actinoid

96: actinoid

97: actinoid

98: actinoid

99: actinoid

100: actinoid

101: actinoid

102: actinoid

103: actinoid

104: 4

105: 5

106: 6

107: 7

108: 8

109: 9

110: 10

111: 11

112: 12

113: 13

114: 14

115: 15

116: 16

117: 17

118: 18