Electron Configurations

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Whats the electron configuration for Magnesium?

What element is (Kr) 5s2 4d2?

What element is (Ar) 4s2?

What element is (Ne) 3s2 3p5

Whats the electron configuration for P?

Whats the shortened EC for Arsenic?

Whats the electron configuration for oxygen?

Whats the electron configuration for Ru?