the thallium nucleus is radioactive, with a half-life of approximately 3.0 min. at a given instant, the activity of a certain sample of thallium is 2400 bq. using the concept of half-life, what is the approximate activity of the sample 9 minutes later?

Fission of uranium-235 products energy and a. isotopes of smaller elements b. isotopes of larger elements c. lighter isotopes of uranium d. heavier isotopes of uranium

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols