82, Lead is Pb. The atomic number is 82, this also equals the protons. If it is stable, then the protons and electrons are going to be the same.
Answer:
Look in explanation.
Explanation:
Mendeleev has ordered the elements based on increasing atomic mass, he has skipped some elements but assumed that they existed and managed to find the atomic mass of the "unknown" elements.
Use the formula in terms of half life from the normal exponential functions
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N(t) = N(0) (1/2) ^ (t/thalf) </span>
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N(0) is the original quantity </span>
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N(t) = quantity remaining at time t </span>
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t is the time </span>
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thalf is half life </span>
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1/16 = (1/2)^(t/3.82) </span>
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16 = 2^(t/3.82) </span>
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4 = t/3.82 </span>
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t = 15.28 days
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ClBr, two nonmetals
Hope this helps you
