June 2011 Chemistry Regents #52-54

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-54 Questions 55-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-70 Questions 71-73 Questions 74-76 Questions 77-79 Questions 80-82 Questions 83-85

 

Questions

Base your answers to questions 52 through 54 on the information below.

The bright-line spectra for three elements and a mixture of elements are shown below.

52. Explain, in terms of both electrons and energy, how the bright-line spectrum of an element is produced. [1]

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excited electrons fall to lower energy levels releasing energy as spectra

energy is emitted when an electron falls back to lower shells

53. Identify all the elements in the mixture. [1]

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lithium and strontium

Li and Sr

54. State the total number of valence electrons in a cadmium atom in the ground state. [1]

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2 valence electrons in Cd

Cd electron configuration 2-8-18-18-2

on to Questions 55-59

 

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-54 Questions 55-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-70 Questions 71-73 Questions 74-76 Questions 77-79 Questions 80-82 Questions 83-85

 
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