Half-life

the half life for uranium-235 is 7.0x108
years.

a. how many half-lives did the sample
go through at the end of 2.8x109
years?

b. how much of a 0.74mg sample of
uranium-235 will remain after 2.8x109
years?

(chemistry)

Non renewable resources like petroleum eventually

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

Which type of intermolecular force is pbr3