tolong bantuannya y.......

1. Pt (Platina) =
Proton =78, elektron = 78, neutron = 117

2. Li (Litium) =
Proton = 3, elektron = 3, neutron = 4

3. Ag (Argentum) =
Proton = 47, elektron = 47, neutron = 61

4. K (Kalium)
Proton = 19, elektron = 19, neutron = 20