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Which of these noble gas configurations (1) represent an atom with unpaired electrons and (2) has more core electrons than it does valence electrons?rn[he]rn[ar]rn[ne]3s²3p⁴rn[he]2s²2p⁴
Accepted Answer
Here's the breakdown:
(1) Unpaired Electrons:
[He]2s²2p⁴ has unpaired electrons. The 2p subshell can hold 6 electrons, but only 4 are filled. This leaves two unpaired electrons in the 2p orbitals.
(2) More Core Electrons than Valence Electrons:
[Ar] has more core electrons than valence electrons. Argon ([Ar]) has 18 electrons. Its electron configuration is 1s²2s²2p⁶3s²3p⁶. The core electrons are those in the inner shells (1s², 2s², 2p⁶). The valence electrons are those in the outermost shell (3s², 3p⁶). Argon has 10 core electrons and 8 valence electrons.
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