Question

1. members of this family are so reactive that they are never found in nature in their pure form. (0.5 points) *

alkaline earth metals
halogens
noble gases
carbon group
nitrogen group
oxygen group
transition metals
lanthanides
alkali metals
boron group
actinides

Explanation:

Alkali metals (Group 1 elements) are highly reactive due to having one valence electron, which they readily lose. This reactivity means they don't exist in nature as pure elements but rather as compounds (e.g., sodium chloride). Halogens (Group 17) are also reactive (gain one electron) but less so than alkali metals in terms of natural occurrence as pure elements. Noble gases are inert. Other groups (carbon, nitrogen, etc.) have varying reactivities but not to the extent of alkali metals in terms of non - natural pure form occurrence.

Answer:

Alkali metals