Half-life chem help?

Question

i ned help with this problem:

C.E Bemis and colleagues at oak ridge national laboratory confirmed the synthesis of element 104, the half-life was only 4.5 s. Only 3000 atoms of the element were created in the tests. How many atoms were left after 4.5 s?

Answer 1

You need to study. You should learn the definition of half-life. The answer is self-evident: 1500. This assumes that the test created all the 104 in the same instant and that the 4.5 s is the time from that instant.

Answer 2

um 1500 right?