Practice IB Chemistry Topic S1.3 Electron Configurations with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for S1.3 Electron Configurations and mirrors Paper 1A, 1B, 2 style where relevant.
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The elements sodium and magnesium are located in Period 3 of the periodic table and show predictable patterns in electron arrangement.
(a) Write the electron configuration of sodium () and magnesium ().
(b) the number of core and valence electrons in each atom.
(c) and which atom has a higher first ionization energy.
Which element has the following ground-state electron configuration: ?
Which atom has the electron configuration ?
Which of the following elements has three unpaired electrons in its ground-state configuration?
What is the number of valence electrons in a nitrogen atom ( )?
(d) Magnesium can also form a ion. how its electron configuration changes and why this ion is stable.
