Question

Tolong dong kak bantuin aku....

Answer 1

1.
23Na11
proton = elektron = nomor atom = 11
neutron = nomor massa - proton = 23 - 11 = 12

40Ca20
proton = elektron = nomor atom = 20
neutron = nomor massa - proton = 40 - 20 = 20

2. nomor atom = proton = 19
   nomor massa = proton + neutron = 19 + 20 = 39
   proton = elektron = 19 ⇒ berarti atom netral ( tidak bermuatan)