Help please!! The graph shows Uranium decay.
What conclusion can be drawn?

A.
The half-life of Lead-207 is about 3,500 million years.

B.
The half-life of Lead-207 is about 800 million years.

C.
The half-life of Uranium-235 is about 800 million years.

D.
The half-life of Uranium-235 is about 3,500 million years.

its mg hope this

b. is the answer hoped i        

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally

the answers are

c and c