Respuesta:
2: 1s2
3: [He] 2s1
4: [He] 2s²
5: [He] 2s2 2p1
6: [He] 2s2 2p2
7: [He] 2s2 2p3
8: [He] 2s² 2p⁴
9: [He] 2s2 2p5
10: [He]2s²2p⁶
11: [Ne] 3s¹
12: Ne 3s2
13: [Ne] 3s² 3p¹
14: [Ne] 3s² 3p²
15: [Ne] 3s² 3p³
16: [Ne] 3s² 3p⁴
17: [Ne] 3s² 3p⁵
18: [Ne] 3s² 3p⁶
19: [Ar] 4s¹
20: [Ar] 4s²
Explicación:
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