A 2+ ion of a particular element has an atomic mass of 203 and 123 neutrons in its nucleus, a) what is the nuclear charge in this element. Why? b)

A 2+ ion of a particular element has an atomic mass of 203 and 123 neutrons in its nucleus,a) what is the nuclear charge in this element. Why?b) what are the symbol and name of this element? How do you know?c) how many valence electrons does a neutral atom of this element have?d) how many levels of electrons are occupied when this element is in its ground state?Can you please explain how you know these answers so I can solve other problems?