Question

A unipositive ion has 18 electron and mass number 39.
1)Find the no. of valence electrons in it.
2)is it a metal or non metal?
3) name the inner gas which has the same electronic configuration as the ion.
THE BEST ANSWER WILL BE MARKED BRAINLIEST!!!!

Answer 1

Answer:

Helium = 2 ; Neon = 2,8 ; Argon = 2,8,8 ; Krypton =2,8,18,8 ; Xenon = 2,8,18,18,8 ; Radon=2,8,18,32,18,8. All have completely filled electrons with valence electron 8.