Never found in nature uncombined?
Alkali metals
Alkaline Earth Metals
Boron Family
Carbon Family
Nitrogen Family
Oxygen Family
Halogen Family
Noble Gases
Elements of the first two groups and halogens are not found uncombined in nature.
The correct answer is the Noble Gases. Noble Gases are chemical elements that are generally unreactive and rarely if ever found in nature in their uncombined form. These elements include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
To determine the correct answer to the question, one can use a combination of general knowledge and research. The question asks for elements that are "never found in nature uncombined," indicating that they are elemental gases that do not readily form compounds with other elements.
First, it is important to have a basic understanding of the periodic table and the different groups or families of elements listed. In this case, we are looking for the group that contains elements that are unreactive and do not readily combine with other elements.
To find this information, one can refer to a reliable source such as a chemistry textbook, an online encyclopedia, or a reputable scientific website. These sources should provide a description of the various groups or families of elements and their characteristics.
By examining the properties and characteristics of the groups listed in the question, it becomes apparent that the Noble Gases fit the description. They are known for their low reactivity and tendency to remain uncombined in nature.
In summary, the Noble Gases, such as helium, neon, and argon, are elements that are never found in nature uncombined. To arrive at this answer, one can use a combination of general knowledge and reference sources to determine the characteristics of the different groups of elements.