Chemistry
posted by Harry .
Uranium238 has half life of 4.51 * 10^9 years
Uranium234 has half life of 2.48 * 10^5 years
Thorium230 has half life of 8.0 * 10^4 years
Radium226 has half life of 1.62 * 10^3 years
Lead210 has half life of 20.4 years.
The rate constant for the decay of unstable nuclide X by alphaparticle emission is 1.17 * 10^6 / day. What is identity of X? Use the following table above to assist in answering the question below. Please show step by step. This is too hard and difficult.

I believe you are over thinking this.
t_{1/2} in day = 0.693/k
Solve for k and divide by 365 to convert to years. Compare with the list of those given.