Sexto Periodo

55-CESIO

56-BARIO

57-LANTANO (Y TIERRAS RARAS)

72-HAFNIO

73-TANTALO

74-WOLFRAMIO

75-RENIO

76-OSMIO

77-IRIDIO

78-PLATINO

79-ORO

80-MERCURIO

81-TALIO

82-PLOMO

83-BISMUTO

84-POLONIO

85-ASTATO

86-RADON

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thirty eight − = 37