QuesLIUI 11 point)
Elements in the noble gas family are considered stable because their outer energy
levels are

Elements in the noble gas family are considered stable because their outer energy levels are very low.

Explanation:

Noble gas is also called inner gases because they are stable due to the completion of outermost shell. Other elements in the periodic table are very reactive so they wants to achieve the electronic configuration of noble gas so that's why they make chemical bonds with each other.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.