The nuclide symbol for an atom is a representation that includes the element’s chemical symbol, atomic number, and mass number. In this case, the atom has 34 protons, which identifies it as the element selenium (Se), since selenium has an atomic number of 34.
To find the mass number, you simply add the number of protons and neutrons together. Here, we have 34 protons and 45 neutrons:
- Mass number = Number of protons + Number of neutrons
- Mass number = 34 + 45 = 79
So, the mass number of this atom is 79. The nuclide symbol follows the format:
A
Z
Element Symbol
where A is the mass number and Z is the atomic number. Therefore, the nuclide symbol for this atom will be:
7934Se
This indicates that the atom is selenium with a mass of 79. In summary, the nuclide symbol for the nucleus of an atom with 34 protons and 45 neutrons is 7934Se.