2. How do we find the number of neutrons in an atom? (10 Points)
a. Add the protons and electrons
b. Subtract the protons from the electrons
c. Subtract the atomic number from the atomic mass
d. Subtract the atomic mass for the atomic number

For all atoms with no charge, the number of electrons is equal to the number of protons. The mass number, 40, is the sum of the protons and the neutrons. To find the number of neutrons, subtract the number of protons from the mass number.

Explanation:

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.