Final answer:
Group 1 and 2 elements on the periodic table are more likely to oxidise, with Group 1 elements forming 1+ ions and Group 2 forming 2+ ions. Both groups are highly reactive and do not occur freely in nature.
Step-by-step explanation:
Elements in Groups 1 and 2 of the periodic table are more likely to oxidise rather than reduce. Group 1 elements, also known as the alkali metals, are very reactive and readily lose an electron to form ions with a charge of 1+. They form ionic compounds that are usually soluble in water and react vigorously with water. On the other hand, Group 2 elements, known as the alkaline earth metals, have their outermost electrons more difficult to remove than alkali metals. However, once these electrons are removed, they exhibit an oxidation state of 2+. Both of these element groups do not exist freely in nature due to their high reactivity and tendency to easily oxidise.