Which element is correctly paired with a possible combination of subatomic particles? (AKS 1b/DOK 2) A.
Fluorine: 8 protons, 9 electrons, 10 neutrons

B.
Barium: 56 protons, 56 electrons, 81 neutrons

C.
Carbon: 12 protons, 12 electrons, 12 neutrons

D.
Helium: 4 protons, 2 electrons, 2 neutrons

i believe it is c.) 1575 j.

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