a radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40…
a radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. which is the symbol of this nuclide?\no $_{21}^{19}k$\no $_{19}^{21}k$\no $_{19}^{40}k$\no $_{40}^{19}k$
Answer
Brief Explanations:
The symbol of a nuclide is written as ${Z}^{A}X$, where $Z$ is the atomic number and $A$ is the mass - number, and $X$ is the chemical symbol. The element with atomic number 19 is potassium (K). Given $Z = 19$ and $A=40$, the symbol is ${19}^{40}K$.
Answer:
$_{19}^{40}K$ (corresponds to the third option in the multiple - choice list)