Yes it does - from the oxygen atom as well as it's own.
No, an oxidized molecule has already lost electrons and is in a lower energy state. In order to gain energy, a molecule would need to be reduced by gaining electrons.
It is an oxidation/reduction reaction. The metal loses electrons to become positively charged (it is oxidized) and the oxygen gains those electrons to become negatively charged (it is reduced). You end up with a metal oxide.
Well it has less electrons than it had before. That is the definition of oxidation. The loss of electrons is oxidation. The gain of electrons is reduction.
In this reaction, Lithium is oxidized to Lithium ions (Li+) and Bromine is reduced to Bromide ions (Br-). Oxidation occurs when an element loses electrons (in this case, Lithium loses an electron), while reduction occurs when an element gains electrons (Bromine gains an electron).
If an element has gained electrons, it has been reduced. If an element has lost electrons, it has been oxidized. This can be determined by comparing the oxidation state of the element before and after the reaction.
Actually, non metals always gain electrons
One example of an oxidation-reduction reaction is the reaction between copper metal and silver nitrate solution. In this reaction, copper metal is oxidized (loses electrons) to form copper ions, while silver ions from the silver nitrate solution are reduced (gain electrons) to form solid silver metal. This results in a redox reaction where electrons are transferred from copper to silver ions.
They need to gain them.
Oxidation is the loss of electrons. Reduction is the gain of electrons. The oxidizing agent is reduced. The reducing agent is oxidized. Cu goes from 0 to +2, it lost electrons S went from +6 to +4, it gained electrons I went from 0 to +5, it lost electrons N went from +5 to +4, it gained electrons.
In this reaction, FeCl2 is the oxidizing agent because it causes another species to be reduced (lose electrons), while SnCl2 is the reducing agent because it causes another species to be oxidized (gain electrons).
Copper is a metal that turns green when oxidized.
In the most common dry cell, which is the alkaline battery, zinc is the metal that is oxidized. When the battery is in use, the zinc undergoes oxidation at the anode, releasing electrons and generating electrical energy.