[noor alrumaihi]

Hi,
I study GCSE Edexcel science. i had a hard question on chemistry and would be grateful if someone would help me.
The question is about atomic structure:

1.deduce the electronic configurations of the first 20 elements from their positions in the periodic table.

^^That's the question and thank you to all who will try to help me.

[billnotgatez]

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