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Give the electronic configuration (electron arrangement) for these elements:

(as an example, an atom of sodium has 11 electrons and so it would be 2,8,1 since the first shell has a maximum of two electrons in it, the second shell has a maximum of eight electrons in it and the third shell has a maximum of eight electrons in it.)

Al (atomic number = 13)

Si (atomic number = 14)

Ca (atomic number = 20)

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