In which of the following groups of ions are the charges all shown
correctly?

magnesium and potassium are the group of ions

Explanation:

magnessium has positive charge and pottasium has negative charge

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.