Question

why are some elements chemically inert

Answer 1

some elements are chemically inert because
they are not able to make a new substance in a chemical reaction therefore some elements are chemically inert. these elements has valency 8 .

Answer 2

hey mate here your answer
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because there outer most electron are complete . there velency is 8 so some elements chemically inert .

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thanks ☺

@manshi