. Why are noble gases the least reactive elements?(1 point)%0D%0AResponses%0D%0A%0D%0AThey are the last elements in each row on the periodic table.%0D%0AThey are the last elements in each row on the periodic table.%0D%0A%0D%0AThey have the same number of neutrons and protons.%0D%0AThey have the same number of neutrons and protons.%0D%0A%0D%0ATheir outermost energy levels have a complete outer shell with 8 electrons.%0D%0ATheir outermost energy levels have a complete outer shell with 8 electrons.%0D%0A%0D%0AThey are all radioactive.%0D%0AThey are all radioactive.

Answer 1

Noble gases are the least reactive elements because their outermost energy levels have a complete outer shell with 8 electrons. This full valence shell configuration makes them stable and unlikely to engage in chemical reactions, as they do not need to gain, lose, or share electrons.