Regents Chemistry Exam August 2025 Question 33 33  There is a decrease in value of which property as the elements in Period 2 are considered in order from lithium to fluorine? (1) atomic radius (2) electronegativity (3) first ionization energy (4) atomic mass Solution: We can look at Table S on the Reference Table which lists all the elements with their atomic radius, electronegativity, and first ionization energies. There should be a decrease in atomic radis as we go from le

Regents Chemistry Exam August 2025 Question 32 32  An atom has a mass number of 112 and contains 48 protons. How many neutrons does this atom contain? (1) 48 (2) 54 (3) 64 (4) 160 Solution: Mass is equal to the number of protons plus neutrons. To get the number of neutrons, we just need to subtract 48 from 112. Choice 3 is the correct answer. LINKS: Regents Chemistry Guides and Solutions Chemistry Tutoring More Regents Chemistry Practice