,rilation between mrs. ,van daan and other residents
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Cl- has 17 protons and an electron configuration of [Ar], or 1s2 2s2 2p6 3s2 3p6 for a total of 18 electrons.
Na+ has 11 protons and an electron configuration of [Ne], or 1s2 2s2 2p6 for a total of 10 electrons.
Cl- is larger than Na+ because its highest electrons are in the 3 shell while Na+ has its highest electrons in the 2 shell. I think you are getting confused with the neutral atomic radius trend which increases as you move down and left across the periodic table. This trend does not work when comparing ions.
If you were comparing the non-ionic Na and Cl atoms, Na would be larger than Cl because Na has an electron configuration of [Ne]3s1 and Cl has an electron configuration of [Ne]3s2 3p5
Since both Na and Cl have their highest electrons in the 3 shell, the thing that matters is how many protons are in the nucleus. Since Cl has 6 more protons than Na, it will pull on the electrons more strongly than the protons of Na, decreasing its size compared to Na.
Cl- has 17 protons and an electron configuration of [Ar], or 1s2 2s2 2p6 3s2 3p6 for a total of 18 electrons.
Na+ has 11 protons and an electron configuration of [Ne], or 1s2 2s2 2p6 for a total of 10 electrons.
Cl- is larger than Na+ because its highest electrons are in the 3 shell while Na+ has its highest electrons in the 2 shell. I think you are getting confused with the neutral atomic radius trend which increases as you move down and left across the periodic table. This trend does not work when comparing ions.
If you were comparing the non-ionic Na and Cl atoms, Na would be larger than Cl because Na has an electron configuration of [Ne]3s1 and Cl has an electron configuration of [Ne]3s2 3p5
Since both Na and Cl have their highest electrons in the 3 shell, the thing that matters is how many protons are in the nucleus. Since Cl has 6 more protons than Na, it will pull on the electrons more strongly than the protons of Na, decreasing its size compared to Na.
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