January 2019 NY Regents Chemistry Exam 31 The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the...

January 2019 NY Regents Chemistry Exam 5 Which electron configuration represents the electrons in an atom of sodium in the ground state...

January 2019 NY Regents Chemistry Exam 4 According to the wave-mechanical model of the atom, electrons are located in (1) orbitals (2)...

January 2019 NY Regents Chemistry Exam 3 In the ground state, valence electrons of a krypton atom are found in (1) the first shell (2)...

January 2019 NY Regents Chemistry Exam 2 Atoms are neutral because the number of (1) protons equals the number of neutrons (2) protons...

January 2019 NY Regents Chemistry Exam 1 The results of the gold foil experiment led to the conclusion that an atom is (1) mostly empty...

August 2019 NY Regents Chemistry Exam 33 Which notations represent atoms that have the same number of protons but a different number of...

August 2019 NY Regents Chemistry Exam 32 Which electron configuration represents the electrons in an atom of sulfur in an excited state?...

August 2019 NY Regents Chemistry Exam 5 Which electron shell in an atom of calcium in the ground state has an electron with the greatest...

August 2019 NY Regents Chemistry Exam 4 An orbital is a region in an atom where there is a high probability of finding (1) an alpha...