Question

8. A class of elements that are poor conductors of electricity

and heat, have a dull appearance, and are generally low
A metalloids
CO
atomic mass unit
B
nonmetals
noble gases

Answer 1

Nonmetals are a class of elements that are poor conductors of electricity and heat, have a dull appearance, and are generally low in atomic mass units.

Step-by-step explanation:

The class of elements described in the question is nonmetals. Nonmetals are elements that are poor conductors of electricity and heat, have a dull appearance, and generally have low atomic mass units. Unlike metals, which are good conductors and have a shiny appearance, nonmetals may exist in different physical states, such as solids, liquids, or gases, depending on the element.

Learn more about Properties of nonmetals