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?

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 class=
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 class=
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 class=
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 class=