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If an element has the atomic number 20, what sub levels are present

If an element has the atomic number 20, what sub levels are present
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If an element has the atomic number 20, what sub levels are present

User Christoph Eicke
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Atomic number = 20 -------> Ca (calcium)

Calcium has four shells (1, 2, 3, 4) and two sublevels ( s, p ).

1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
User Alex Ball
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