Which feature is forming?

mountain
rift valley
earthquake
island chain

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.

it is stable as it is in group 0 which have full outer shells of electrons