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katrin [286]
3 years ago
9

If there are 5 protons, how many electrons does the atom have?

Chemistry
1 answer:
Tresset [83]3 years ago
6 0
If this is a single atom of Boron, there should be 5 electrons as well. Boron as an electron configuration of 2-3 or 1s2 2s2 2p
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Cobalt-60 is a strong gamma emitter that has a half- life of 5.26 yr. The co balt-60 in a radiotherapy unit must be replaced whe
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<u>Answer:</u> The sample of Cobalt-60 isotope must be replaced in January 2027

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The equation used to calculate rate constant from given half life for first order kinetics:

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where,

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Rate law expression for first order kinetics is given by the equation:

k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}

where,

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t = time taken for decay process = ? yr

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Putting values in above equation, we get:

0.132=\frac{2.303}{t}\log\frac{100}{25}\\\\t=10.5yrs

The original sample was purchased in June 2016

As, June is the 6th month of the year, which means the time period will be 2016+\frac{6}{12}=2016.5

Adding the time in the original time period, we get:

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