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Which of the following is/are not radioactive element(s)? |
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a) |
Sulphur |
b) |
Tellurium |
c) |
Selenium |
d) |
Polonium |
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Which of the following is/are not radioactive element(s)? |
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|
a) |
Sulphur |
b) |
Tellurium |
c) |
Selenium |
d) |
Polonium |
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(a,b,c) Polonium is a radioactive element |