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2. Z=4 --- 1S² 2S²
3. Z=16 --- 1S² 2S² 2P⁶ 3S² 3P⁴
4. Z=17 --- 1S² 2S² 2P⁶ 3S² 3P⁵
5. Z=33 ---- 1S² 2S² 2P⁶ 3S² 3P⁶ 3d¹⁰ 4S² 4P³