7. Which group of elements does not have metallic properties? alkali metals
alkaline earth elements
o noble gases
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Typically non-metals are not able to conduct electricity or heat very well and are often gases, such as oxygen, or solids, like carbon. Therefore, non-metals are the elements in groups 14-16 of the periodic table.

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.