open your eyes, you will see nothing open your mind, you will be confused
open your hearth, you will see
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Nomor Atom = 19Massa Atom = 39
Proton = 19 (Sama seperti Nomor Atom)
Neuron = Massa Atom - Proton
= 39 - 19= 20Elektron = Nomor atom - (muatan)
= 19 - (+1)= 18 (e < p)