To identify the noble gas whose electron configuration is shared by the ion, let’s first write the ground-state electron configuration of each ion.
Ground-state means that elements are in their lowest energy form (not in an excited state). The elements have no charge (neutral element) which means that no electrons are removed or added in the atom.
Neutral element: Atomic number = # protons = # of electrons
A. Beryllium Be:
• Atomic number = 4
• # of electrons = 4 e-
Match each ion with the noble gas whose electron configuration it shares.
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