Question

not able to conduct heat or electricity, little to no metallic luster
atomic mass
noble gases
neutron
non - metals

Explanation:

The description "not able to conduct heat or electricity, little to no metallic luster" matches the properties of non - metals. Atomic mass is a property of atoms, noble gases are a group of elements with specific gaseous properties, and a neutron is a sub - atomic particle. So the correct term is Non - metals.

Answer:

Non - metals