The chart shows rate of decay.
Which value is being measured in the columns labeled
"Fraction remaining" and "Percentage remaining"?
Half-
lives
elapsed
Fraction | Percentage
remaining | remaining
years of decay
quantity of energy
number of stable atoms
amount of material that has not decayed
1/1
100
1/2
50
1/4
25
1/8
12.5
1/16
6.25