Answer: Find the attached file for the answer.
Explanation:
When an element decays with alpha particles, the alpha particles involved is helium 4 elements.
When a Gold-185 decays by alpha decay, it will decay to form iridium 181
The Atomic number of gold is 79 and the atomic number of helium is 2
To balance the nuclear reaction,
The Atomic number of iridium will be:
79 = x + 2
X = 79 - 2 = 77
The mass number of gold is 185 and the helium mass number is 4
The mass number of iridium is:
185 = M + 4
M = 185 - 4 = 181
Find the attached file for the remaining solution.
