Which of the following have their outer most shell complete in atomic form ?
Correct answer: A. Noble gases
- A. Noble gases
- B. Alkali metals
- C. Coinage metals
- D. Gun metals
Explanation
Noble gases have completely filled outermost shells in their neutral atomic form, which gives them exceptional stability and low chemical reactivity. Alkali metals have one valence electron, while coinage and gun metals do not generally have a completely filled outermost shell in the simple valence-shell sense. The likely mistake is choosing coinage metals because some have filled d subshells, but their outermost shell is not the relevant completed shell.
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