The answer is actually (A.) Trans-radiation
-5.
-5 * 2 = -10
-10 + 17 = 7
Carbon dioxide is the atmospheric compound that is
responsible (after it have dissolved in water) for both the general acidity of
normal rainwater and the acidity of much soil. Natural rain water is slightly
acidic because carbon dioxide combined with water in the air forms carbonic
acid, which is a weak acid.
The correct answer is elements in family 7 have similar properties because elements in the same group or family have the same number of valence electrons.
