The two elements are FLUORINE AND CHLORINE. These two elements have similar characteristics because they belong to the same group in the periodic table.
On the periodic table, elements with similar properties are grouped together in the same group. Both chlorine and fluorine belongs to the halogen group.
Many factors including farming method, where food is grown, what pesticides and fertilisers are used, what is fed to our livestock, and so on, affect the environmental impact of the food we buy and eat. ... Water and air pollution, loss of wildlife, and of natural habitats all result from food production.