June 2011 Chemistry Regents #52-54

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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] HIGHLIGHT TO SEE THE ANSWER 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] HIGHLIGHT TO SEE THE ANSWER lithium and strontium Li and Sr 54. State the total number of valence electrons in a cadmium atom in the ground state. [1] HIGHLIGHT TO SEE THE ANSWER 2 valence electrons in Cd Cd electron configuration 2-8-18-18-2 on to Questions 55-59

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