1. Which atom has its valence electrons in a single sublevel?

     (A) Cl
     (B) Mg
     (C) Al
     (D) P

1. Which atom has its valence electrons in a single sublevel?
2. Which element forms a stable diatomic molecule?

Expert Solution

1) Answer is Mg.

Atomic number of magnesium is 12 thus, it's electronic configuration is 1s², 2s², 2p⁶, 3s². Hence, valence electrons are present only in 3s subshell. Whereas in other element it is present in different subshells.

2) Answer is Cl.

Electronic configuration of Cl is 1s²,2s²,2p⁶,3s²,3p⁵ hence it need only one electron to achieve stable noble gas configuration which can be obtained by forming diatomic molecule Cl2.

queen_honey_blossom answered 2 years ago

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