June 2015 Chemistry Regents #66-68

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

 

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Questions 66-68

 

 

Base your answers to questions 66 through 69 on the information below and on your knowledge of chemistry.

The Bohr model of the atom was developed in the early part of the twentieth century. A diagram of the Bohr model for one atom, in the ground state, of a specific element is shown below. The nucleus of this atom contains 4 protons and 5 neutrons.

66 State the atomic number and the mass number of this element. [1]

Answer--> Atomic Number =4  Mass number= 9

67 State the number of electrons in each shell in this atom in the ground state.

Answer-->

First shell=2

Second shell= 2

68 Using the Bohr model, describe the changes in electron energy and electron location when an atom changes from the ground state to an excited state.

Answer-->

 Change in electron energy= Increases

Change in Electron Location= higher energy level  (further away from the nucleus)

on to Questions 69-72

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

 

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