Mostrar mensagens com a etiqueta photOmatic. Mostrar todas as mensagens
Mostrar mensagens com a etiqueta photOmatic. Mostrar todas as mensagens
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polonium
Polonium is a very rare element in nature because of the short half-life of all its isotopes. It is found in uranium ores at about 100 micrograms per metric ton (1 part in 1010), which is approximately 0.2% of the abundance of radium. The amounts in the Earth's crust are not harmful. Polonium has been found in tobacco smoke from tobacco leaves grown with phosphate fertilizers
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11.1.12
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