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Li+
Be2+
b)
F-
O2-
N3-
C4-
c)
Cl-
S2-
P3-
Si4-
B) C(4-), N(3-), O(2-), F(-), Si(4+), Al(3+), Mg(2+), Na(+),
C) Si(4-), P(3-), S(2-), Cl(-), Ge(4+), Ga(3+), Ca(2+), K(+)