Question

what is ions write the formula of two cations and abions its very importance plz.

Answer 1

An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule.

The cation are 

(Aluminium) Al - $3e^{-}$ -----> $Al^{+3}$

(Calcium) Ca - $2e^{-}$ -----> $Ca^{+2}$

The anion are 

(Fluoride) F - $e^{-}$ ------> $F^{-}$

(Iodide) I - $e^{-}$ -----> $I^{-}$

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