How are elements arranged in the periodic table?
a.
by atomic mass
b.
alphabetically
c.
by atomic number
d.
by the date of discovery

C. by atomic number

Explanation:

The chemical elements are arranged in order of increasing atomic number, elements with similar properties are arranged in the same column and elements with the same number of electrons are arranged in the same row.

gas

explanation:

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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.