Answer:
The statements that describe Mg are:
1. is very reactive as a metal
2. forms a basic solution in water
3. is found in nature only combined with other elements
Explanation:
Magnesium is a s-block chemical element that belongs to group 2 and period 3 of the periodic table. It is a reactive alkaline earth metal that exists in nature only in the combined state with elements such as carbon, calcium and oxygen.
Magnesium reacts with water at room temperature, to give strongly basic metal oxide of the formula, MgO, which forms a basic solution in water.
It also reacts vigorously with halogens such as chlorine and bromine, to form salts.