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PhyCS

(1) Ar is your answer. Argon is a noble gas, which is stable in its standard valence electron configuration because it already completed its valence shell following the octet rule.

Answer: (1) Ar

Explanation: Argon is an element with atomic number of 18. Thus it contains 18 electrons. It's electronic configuration in ground state is:

\(1s^22s^22p^63s^23p^6\)

As argon contains completely filled orbitals, it is stable and is a inert element.

Aluminium is an element with atomic number of 13. Thus it contains 13 electrons. It's electronic configuration in ground state is: \(1s^22s^22p^63s^23p^1\)

Silicon is an element with atomic number of 14. Thus it contains 14 electrons. It's electronic configuration in ground state is: \(1s^22s^22p^63s^23p^2\)

Sodium is an element with atomic number of 11. Thus it contains 11 electrons. It's electronic configuration in ground state is: \(1s^22s^22p^63s^1\)






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