Which statements are true concerning elements in the same group of the periodic table? Select all that apply. A) They have similar periodic properties.
B) They are all metals or nonmetals, but not both.
C) They have the same number of shells of electrons
D) They have the same number of inner core electrons.
E)They have the same outer shell (valence) electron configuration

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

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.

the right answer is c i just did the question.

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