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Write the formula obtained when this atoms loses or gains valence electrons and becomes an ion. Tell whether it is a cation or an anion. Be

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Atomic number for Be?
i guess i dont know
ITs 4..that means the valence shells ar filled like K=2 L=2

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now L can hold 8 the closest stable configuration would be K=2 L=0
what would the formulas be?
It loses 2 electrons so its Be 2+
okay so is it a cation or anion?
Cations are always this is a cation ok?
okay so cation is positive and anion is negative right?
B2- anion

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