Question: Without referring to a periodic table, write the electron configuration of elements with the following atomic numbers: (a) 9, (b) 20, (c) 26, (d) 33.

Without referring to a periodic table, write the electron configuration of elements with the following atomic numbers:
(a) 9,
(b) 20,
(c) 26,
(d) 33.
Classify the elements.

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