Radon-219 has a half-life of about 4 s. After 20 s, how many milligrams of a 500 mg sample will remain?

435.3 mg

211.6 mg

31.3 mg

15.6 mg

Help please I’ll make you the brainliest if right

15.6 mg

Step-by-step explanation:

First 4 s- 500/2= 250 mg

After 8 s- 250/2= 125 mg

After 12 s- 125/2= 62.5 mg

After 16 s- 62.5/2= 31.25 mg

At 20 s- 31.25/2= 15.625 mg

step-by-step explanation: you take each of the numbers and divide by the amount then you take the range

the factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. hope this ! mark brainliest! you v much! : )