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1s²
b) z = 8
1s²
2s² 2p⁴
c) Z = 9
1s²
2s² 2p⁵
d) Z = 12
1s²
2s² 2p⁶
3s²
e) Z = 17
1s²
2s² 2p⁶
3s² 3p⁵
f) Z = 18
1s²
2s² 2p⁶
3s² 3p⁶
2.
Li ⁺¹
F⁻¹
Na⁺¹
Al⁺³
Cl⁻¹
K⁺²