June 2017 NY Regents Chemistry Exam 5 Which electron transition in an excited atom results in a release of energy? (1) first shell to...

June 2017 NY Regents Chemistry Exam 4 Which particle has the least mass? (1) a proton (2) an electron (3) a helium atom (4) a hydrogen...

June 2017 NY Regents Chemistry Exam 3 What is the number of electrons in an atom of scandium? (1) 21 (2) 24 (3) 45 (4) 66 Solution: In a...

June 2017 NY Regents Chemistry Exam 2 Which term is defined as the region in an atom where an electron is most likely to be located? (1)...

June 2017 NY Regents Chemistry Exam 1 Which statement describes the structure of an atom? (1) The nucleus contains positively charged...

June 2018 NY Regents Chemistry Exam 36 What is the total number of neutrons in an atom of K-42? (1) 19 (2) 20 (3) 23 (4) 42 Solution:...

June 2018 NY Regents Chemistry Exam 35 Which electron configuration represents a potassium atom in an excited state? (1) 2-7-6 (2) 2-8-5...

June 2018 NY Regents Chemistry Exam 34 What is the approximate mass of an atom that contains 26 protons, 26 electrons and 19 neutrons? (1)...

June 2018 NY Regents Chemistry Exam 33 The table below shows the number of protons, neutrons, and electrons in four ions. Which ion has a...

June 2018 NY Regents Chemistry Exam 5 The weighted average of the atomic masses of the naturally occuring isotopes of an element is the...