NY Regents Chemistry Exam August 2023 Question 4
4 An element that is a very reactive metal could have an atomic number of
(1) 9
(2) 2
(3) 19
(4) 79
Solution: Very reactive metals are located in Group 1 on the Periodic Table. Atomic number is shown as the bold number below each element. Potassium (K) is a metal in Group 1 with an atomic number of 19 (Choice 3)
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