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b) neon Ne
2) p=protony, e=elektrony
Zn2+: p=30, e=28
S2-: p=16, e=18
Cl: p=17, e=17
K: p=19, e=19
Na+: p=11, e:10
Br-: p=35, e=36
Ca: p=20, e=20
Pb4+: p=82, e=78
3)a) K+
b) Br-
KBr czyli bromek potasu