File talk:Beryllium diagonal rule.svg
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Are you sure that there are only 3 electrons in the second example? — Preceding unsigned comment was added by 112.141.158.171 (talk) 08:48, 7 March 2019 (UTC)
Are you sure that there are only 3 electrons in the second example? — Preceding unsigned comment was added by 112.141.158.171 (talk) 08:48, 7 March 2019 (UTC)[reply]
