All Elements are obtained in the periodic table & water is Not an element it is a compound.
It would 47.7 because you would have to both minus the number together.
It's 1 because there is only one electron on the outer shell.
(E) ionic aluminum fluoride (AlF3)
We are given the following equation:
y = y0 e^-0.0001216 t
where y = 1/5 y0, y0 is the original amount
So solving for time t:
1/5 y0= y0 e^-0.0001216 t
t = 13,235.51 years
So the human died about 13235.5 years ago
