Utente:AGeremia/Sandbox/prova1

${\ce {PO4-}}$ ${\ce {PO4^3- + O2 -> 2CaO}}$

${\ce {H2^+}}$

${\ce {H2^-}}$

1. ${\ce {Li2}}$, ${\ce {Be2^+}}$, ${\ce {Be2}}$.
2. ${\ce {F2}}$, ${\ce {F2^+}}$, Errore del parser (errore di sintassi): {\displaystyle \ce{F2^−}}
3. ${\ce {N2}}$, ${\ce {N2^+}}$, ${\ce {N2^-}}$.