A-LevelChemistryChemical periodicityMay/June 2012Paper 1 Q151 Mark
The period 4 elements gallium (Ga), germanium (Ge), arsenic (As) and selenium (Se) are the elements below aluminium, silicon, phosphorus and sulfur in the Periodic Table, a portion of which is shown below. [Figure 15.1] The properties of each period 4 element resemble those of the period 3 element directly above it. Which period 4 elements form oxides that dissolve in water to give an acid solution?
AAs and Se
BGa and Ge
CGa and Se
DSe only
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The correct answer is A. This question tests the candidate's understanding of chemical periodicity within the Chemistrysyllabus. The examiner's mark scheme requires...
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