Give the chemical formulae of the stable...

Give the chemical formulae of the stable binary compounds formed by the combination of the following pairs of elements.

Mg and `N_(2)`

Li and `O_(2)`

Al and `Cl_(2)`

K and`O_(2)`

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a`Mg_(3)N_(2)` b. `Li_(2)O` c. `AlCl_(3)` d. `K_(2)O`

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