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Neutral calcium has 20 protons and 20 electrons. The first 20 atomic orbitals are filled as 1s2 2s2 2p6 3s2 3p6 4s2. The shorthand for this is [Ar] 4s2 since argon's configuration is 1s2 2s2 2p6 3s2 3p6.

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Wiki User

13y ago
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13y ago

[Ar] 4s2 i think

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Wiki User

11y ago

1s22s22p63s23p64s2

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Wiki User

13y ago

[Ar] 4s2

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Anonymous

Lvl 1
4y ago

Sodium

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Anonymous

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4y ago

Iron

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Q: What is the shorthand electron configuation of calcium?
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