A neutral atom has 2 electrons in the first energy level and 3 electrons in the second energy level. Which atom is this?
1 answer:
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Answer:
288 grams
Explanation:
The amount of any radiative substance left after some time is calculated by
amount left =
where x is the initial amount of substance
n is the number of half lives
one half live is the time in which amount of substance reduce to half of its initial value.
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amount left = 4.5 grams
half life of iodine-125 = 60 days
total time in which substance reduced to 4.5 grams = 360 days
thus,
number of half life in 60 days = 360/60 = 6
thus, there are period of 6 half lives
in each half life the amount of substance reduces to its previous half
let the initial amount be x grams
using the formula
amount left =
Thus, 288 grams was the initial amount of iodine-125