1s² 2s² 3s² elektron dizilimine sahip element, 3. periyot, 2. grup (2A) elementlerinden biridir. Bu elektron dizilimine sahip bazı elementler: Magnezyum (Mg): 1s² 2s² 2p⁶ 3s²; Kalsiyum (Ca): 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².
1s² 2s² 2p⁶ elektron dizilimi, Neon (Ne) elementine aittir. Bu elektron dizilimi, aynı zamanda periyodik tabloda 2. periyot 8. grupta (soy gazlar) yer alan elementlerin genel elektron dizilimine örnektir. Bir elementin hangi gruba ait olduğunu belirlemek için elektron diziliminin yanı sıra, periyodik tablodaki konumu ve değerlik elektron sayısı gibi faktörler de dikkate alınmalıdır.
Elektron dağılımı 3s² 3p¹ olan atomun: Periyodu: 3. enerji seviyesinde elektron bulundurduğu için 3. periyottadır. Grubu: 3p orbitaliyle sonlandığı için 16. gruptadır.
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