Help with chemistry for half life and years old? pls?

Question

anonymous · Answer

http://assets.openstudy.com/updates/attachments/54628644e4b0d1b198dd320c-lordofpens-1415743100433-uc_photo_014.jpg

anonymous · Answer

this is suppose to be basic and for my level, we don't need the formulas?

anonymous · Answer

@thomaster

jfraser · Answer

each atom of $^{216}Po$ will eventually decay into $Pb^{212}$, says the problem. It is very important to realize that the TOTAL number of atoms will be conserved: 1 atom of Po will decay into 1 atom of Pb. Knowing the ratio of atoms (195:65) lets you find the percentages of the two atoms. Does that help?

anonymous · Answer

@JFraser  im not so sure still. am i suppose to convert it?

jfraser · Answer

you don't have to convert anything. If you consider the atoms at "age zero", all of the atoms will be $^{216}Po$, right?

jfraser · Answer

slowly, the atoms will decay into $Pb^{212}$, but each atom that decays is still part of the system. So the total number of atoms will always be 260