Chemistry, 16.01.2021 16:10 tefanyc13

The half life of iodine-125 is 60 days. What fraction of iodine-125 nuclides would be left after 360 days?

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Answer from: ketabug50

Explanation:

The half-life is the time taken for a radioactive substance to decay to half of its original composition.

Let us assume that the original amount is x atoms;

Half - life = 60days

Days Composition Half-life number

0 x 0

60 x/2 1

120 x/4 2

180 x/8 3

240 x/16 4

300 x/32 5

360 x/64 6

The fraction that would be left after 360 days will be $\frac{1}{64}$

Answer from: Quest

in scientific notation, the value of the speed of light in a vacuum

will be written as 2.995 * 10^8. when this value is represented in the form of

a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

Answer from: Quest

If a hydrogen atom is neutral, it must also have one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

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The half life of iodine-125 is 60 days. What fraction of iodine-125 nuclides would be left after 360...