January 2020 NY Regents Chemistry Exam
5 Which element has chemical properties that are most similar to potassium?
(1) calcium
(2) cesium
(3) nitrogen
(4) sulfur
Solution: Elements in the same group (column) on the Periodic Table have similar chemical properties because they have the same number of valence electrons. Potassium is in group 1 on the Periodic Table. Cesium is group 1 as well.
Answer: 2
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