it is your mom
2.5
Only 75 atoms
125
If you understand by particles atoms they remain unchanged.
Iron is a magnetic substance. Place a magnet over the sample. Iron will stick to the magnet, while sulfur will remain.
1 mg
Only 75 atoms
halflife
2.5
7.48
A sample of 187 rhenium decays to 187-omium with halflife of 41.6 billion years. If all 188 osmium are normalized isotopes.
One sixteenth of a gram. 1st halflife- 1/2 gram 2nd, 1/4 3rd 1/8th 4th halflife, 1/16th
After 6 half lives, the remaining will be (1/2)6 i.e 1/64 th of the initial amount. Hence by percentage it would be 1.5625 %
125
Approx 1/8 will remain.
what?
The length of time required for half of a sample of radioactive material to decay
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.