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Complete and balance this equation for a combination reaction.

Be + O2 ==>

Would it be Be + O2 ==> BeO2 ?
or... 2Be + O2 ==> 2BeO ? Why??

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The reaction is
Be + O2 ==> BeO. Be is in group II, O is in group VI (or 16 depending upon the system you are using); therefore, the formula is BeO. To balance,
2Be + O2 --> 2BeO

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