Half life is the time taken for half a quantity of a substance to decay . fermium (atomic number 100 ) has 19 isotopes , most of which have half-lives if less than a second .

from the Fermium 257, he's got 100Kgs of Fermium 252, and Fermium 253.

the 252 is 40%, well, 40% of 100 is just 40, so 40 of Fermium 252, with a half-life of 1 day.

and 60% of 100 is just 60, so 60Kgs of Fermium 253 with a half-life of 3 days.

from August 31st to September 15, that'd be 15 days later, so how much is left altogether after 15 days.

yes the data was not prsented

step-by-step explanation:

2 x 503

step-by-step explanation:

its 1006