January 2010 Chemistry Regents #61-63

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 

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Questions

Base your answers to questions 61 through 63 on the information below.

The atomic and ionic radii for sodium and chlorine are shown in the table below.

61 Write the ground state electron configuration for the ion that has a radius of 181 picometers. [1]

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2-8-8  see periodic table

62 Convert the radius of an Na+ ion to meters. [1]

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1.02 10-10 m

0.000 000 000 102 m

Regents Conversions Trick Replace the prefix with the exponent from Table C

102pm==> 102 x 10-12m (also an answer)

63 Explain, in terms of atomic structure, why the radius of an Na atom is larger than the radius of an Na+ ion. [1]

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The ion has 1 less energy level than the atom.

A sodium atom loses the electron in its outer shell, causing the radius of the ion to be smaller than the radius of the atom.

An Na atom has three electron shells, but an Na+ ion has only two electron shells.

On to Questions 64-65

 

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 
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