In radioactive decay,which one of the following moves the fastest?

The $\beta$-decay of $_{11}Na^{24}$ produces an isotope of

After the emission of a $\beta$-particle followed by an $\alpha$-particle from ${ }_{83}^{214} Bi$,the number of neutrons in the resulting atom is:

$A$ radioactive nuclide $X$ decays at the rate of $1.00 \times 10^5 \ disintegration \ s^{-1} \ g^{-1}$. Radium decays at the rate of $3.70 \times 10^{10} \ disintegration \ s^{-1} \ g^{-1}$. The activity of $X$ in millicuries $g^{-1}$ $(mCi \ g^{-1})$ is

Which of the following statements is correct?

$^{27}_{13}A$ is a stable element. $^{29}_{13}A$ is expected to disintegrate by: