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How many of the following reactions proc...

How many of the following reactions proceed with the absorption of energy?
`Cl(g) to CI^(-)(g)`
`O^(2-) (g) to O^(-)(g)`
`N(g) to N^(-)(g)`
`Mg(g) to Mg^(2+)(g)`
`Cl^(-)(g) to Cl^(2-)(g)`
`Be(g) to Be^(-)(g)`

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4
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