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How many ion H2- does have
The H2- ion having three electrons. This can be conceived as the combination of a hydrogen atom with a hydride ion (H-). By the aufbau principle, two occupy the bonding molecular orbital, and one occupies the antibonding molecular orbital. Because the bonding molecular orbital haves a greater number of electrons than the antibonding molecular orbital, this species is stable. Notice that in terms of electron occupancy, H2- and He2+ are identical.
Delocalisation of electrons in conjugated system is called resonance. For example there is delocalisation of electrons in benzene ,hence we write kekule structure for benzen.
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