August 2019 NY Regents Chemistry Exam 2 In all atoms of bismuth, the number of electrons must equal the (1) number of protons (2) ...

August 2019 NY Regents Chemistry Exam 1 Which statement describes the earliest model of the atom? (1) An atom is an indivisible hard...

January 2020 NY Regents Chemistry Exam 33 What is the number of valence electrons in a nitrogen atom in the ground state? (1) 5 (2) 2...

January 2020 Ny Regents Chemistry Exam 32 Which electron configuration could represent the electrons in a sodium atom in an excited...

January 2020 NY Regents Chemistry Exam 9 Which part of a calcium atom in the ground state is represented by the dots in its Lewis...

January 2020 NY Regents Chemistry Exam 3 Two atoms that are different isotopes of the same element have (1) the same number of protons...

January 2020 NY Regents Chemistry Exam 2 As an electron in an atom moves from a higher energy state to a lower energy state, the atom...

June 2023 NY Regents Chemistry Exam 33 A potassium atom has a mass number of 37. What is the number of neutrons in this atom? (1) 15 (2)...

June 2023 NY Regents Chemistry Exam 31 Which Lewis electron-dot diagram represents an atom of nitrogen in the ground state? Solution:The...

June 2023 NY Regents Chemistry Exam 3 The wave-mechanical model of the atom describes the location of electrons (1) as loosely packed in...