How many half lives does it take for an unstable isotope to decay from 256g to only 8g?​

let that person have a turn to speak : )

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

catya that's not even a b or c