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Which of the following electron configurations is/are INCORRECT?
Watter van die volgende elektronkonfigurasies is VERKEERD?
Ca2+: 1s2 2s2 2p6 3s2 3p6
Co: [Ar] 4s2 3d5 4p2
Br: [Ar] 4s2 3d10 3p5
Si: 1s2 2s2 2p63s23p2
N: [He]2s2 2p3
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