Question

what is the difference between halogen and noble gases

Answer 1

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Halogens are extremely reactive elements because they need one more electron to gain a full octet of valence electrons, whereas the noble gases are extremely unstable because they already have their full octet. Noble gases are, well, gases.

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Answer 2

Answer:

Explanation:

Noble gases are those elements in the periodic table that have a completely filled valence shell that neither lose or gain any electrons causing them to be stable. Noble gases are least reactive in their nature.

Whereas:

Halogen having incompletely filled valence shells are any of the components fluorine, chlorine, bromine, iodine, and bromine, possessing seven electrons which is unstable (and that needed to gain one more electron to be stable) from the periodic  table. They are responsive non-metallic components that structure firmly acidic mixes with hydrogen from which straightforward salts can be made.