Question

oxygen is changed into oxide ion by .... electron​

Answer 1

$\huge\underline{\underline{\blue{\mathcal{Answer↡}}}}$

In both cases, the metal acquires a positive charge by transferring electrons to the neutral oxygen atoms of an oxygen molecule. As a result, the oxygen atoms acquire a negative charge and form oxide ions (O²−). ... Therefore, these reactions are known as oxidation-reduction reactions, or "redox" reactions for short.

$\mathcal\pink{ I \: Hope \: it \: helps \: u.}$

$\Huge\fbox{\color{red}{@NehaNagal}}$

Answer 2

Oxygen (O2-)

Hope this may help you