January 2012 Chemistry Regents #51-54

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Question

Base your answers to questions 51 through 54 on the information below.

 

51 Estimate the radius of a Br- ion. [1]

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value greater than 181 pm and less than 220. pm.

52 Explain, in terms of electron shells, why the radius of a K+ ion is greater than the radius of an Na+ ion. [I]

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A K+ ion has three electron shells and all Na+ ion has only two.

A sodium ion has fewer electron shells than a potassium ion .

53 Write both the name and the charge of the particle that is gained by an F' atom when the atom becomes an F- ion. [1]HIGHLIGHT TO SEE THE ANSWER

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Particle: electron

Charge of particle: - 1

54 State the relationship between atomic number and first ionization energy as the elements in Group 1 are considered in order of increasing atomic number. [1]

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As atomic number increases, first ionization energy decrease.

 

on to Questions 55-57

  

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50 Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74 Questions 75-78  Questions 79-81  Questions 82-85

 
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