Give me the number of valence electrons for so4 2-

The answer to this question would be: 32

To answer this question, you need to know the valence of sulfur(S) and oxygen(O) atom. Both sulfur and oxygen have 6 valences electron. In the molecule, there are 1 sulfur and 4 oxygen, then the calculation should be:
sulfur :1 *6= 6
oxygen:4 *6= 24
charge(-2)= 2
total= 6+24+2=32

What? i don’t understand