The atomic number of Al and Cl are 13 and 17, respectively. What will be the number of electrons in Al3+ and Cl-?

The atomic number of Al and Cl are 13 and 17, respectively. What will be the number of electrons in Al3+ and Cl-?

Answer:
Atomic number of Al = Number of electrons =13
Number of electrons in Al 3+ = 13 - 3 = 10
Atomic number of chlorine = Number of electrons =17
Number of electrons in Cl- =17+1 = 18