2 years ago

What is the purpose of researching elements on the periodic table?

1 answer:

7 0

he number of protons give elements their unique chemical properties, and define their electron energy levels. All three of these elements are naturally occurring, and act chemically like hydrogen because they each have one proton. The different number of neutrons gives them all greatly different atomic mass.

question answered by (jacemorris04)

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FrozenT [24]

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3 years ago

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3 years ago

After 11.5 days, 12.5% of a sample of radon-222 that originally weighed 42g remains. What is the half-life of this isotope?

Bond [772]

Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value. The equation to describe the decay is
Nt=N0(1/2) $^{t/t(1/2)}$ where N0 is the initial quantity, Nt is the remaining quantity after time t, t1/2 is the half-time. So work out the equation, t1/2 = t (-ln2)/ln(Nt/N0) = 11.5*(-ln2)/ln(12.5/100) = 3.83 days