Which of the following elements has no known stable isotopes?
A
Carbon
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B
Silver
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C
Radon
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D
Phosphorus
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E
Lead
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Solution
The correct option is C Radon Only Radon in given elements has no known stable isotopes.
Carbon (C) has 15 known isotopes, from 8Cto 22C, 2 of which (12C and 13C) are stable.
Silver has 28 known isotops. Naturally occurring silver (Ag) is composed of the two stable isotopes 107Ag and 109Ag with 107Ag being the more abundant.
phosphorus (P) has 23 isotopes from 24P to 46P, only one of these isotopes is stable 31P.
`Lead (Pb) has four stable isotopes: 204Pb,206Pb,207Pb,208Pb`.