(see attachment) This element has 3 energy shells. The outer shell of this element was determined as illustrated here.

According to the Periodic Table of Elements, it must be:

Beryllium (Be)
Nitrogen (N)
Argon (Ar)
Oxygen (O)

Atoms of period 3 elements must: have full K shells (2 electrons in the first energy level) have full L shells (8 electrons in the second energy level)

Explanation:

must be nitrogen

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.