Is iron likely to gain electrons, why?

no

Explanation:

Fe (iron) loses three electrons.The ionic bond between ions results from the electrostatic attraction of opposite charges.

astronomers such as edwin hubble.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.