Period number and group number in the periodic table are numerically equal for which of the following elements? A) (₁₃Al) B) (₃₃As) C) (₅₁Sb) D) more than one correct response E) no correct response

Question

Quizplus · Accepted Answer

Elements in the periodic table that have their period number and group number numerically equal are typically found in the main groups (s and p blocks). Aluminum (Al) with atomic number 13 is in period 3 and group 13, and Arsenic (As) with atomic number 33 is in period 4 and group 15, not matching the criteria. However, Antimony (Sb) with atomic number 51 is not in a period and group that are numerically equal. The correct interpretation here is that both Aluminum (Al) and Arsenic (As) are incorrectly analyzed in the explanation, leading to a misunderstanding. The correct statement should acknowledge that only Aluminum (Al) fits the criteria of having its period number and group number numerically equal, being in period 3 and group 13. Therefore, the initial response indicating more than one correct response was incorrect, and the accurate answer should be that only Aluminum (Al) fits the described criteria, making the correct choice "A" for Aluminum.

Period Number and Group Number in the Periodic Table Are