Auranium-235 sample starts with 200 atoms, and 700 million years later, there are 100 atoms. what is the half-life of uranium-235?
a. 350 million years
b. 235 years
c. 100 years
d. 700 million years

D. 700 million years APEX

u can delete ur account.

1. go on google and write

2 open this and click on your profile pic and if your profile is not appearing, then u have to log in.

3. when u click on your profile pic, there appears four options on the top.

4. click on the 1st option and scroll down and go at the bottom.

5. click on edit profile.

6. there appears a option 'prefernces' and at that option at the right side , 'edit' is written.

7. click on the edit option.

8. there is a option " i want to delete my account" and click on that.

hope this u

and ur welcm

: )

dang that balls went far