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Ch 9 Example Problems Answers

Ch 9 Example Problems Answers - HODSON CHE 1301 Petrucci...

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HODSON CHE 1301 Petrucci Ch9 Example Problems The following problems are taken from old exams ...... 1
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The  transition  elements  refer to  what  group of  elements? 
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1) 
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_______ 
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lanthanides  
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s - block elements  
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actinides  
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d - block elements  
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p - block elements     Answer: D Explanatio n: For the  ‘B’ group,  or  transition  elements  on the  periodic  table, the  highest  energy  electrons  are being  added into  a d  sublevel  (Sc  through  Zn, Y  through  Cd and La  through  Hg), and  so they are  called the  d block  elements. 
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Which of  the  following  could  never be  isoelectron ic species? 
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2) 
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_______ 
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atoms of two  different elements  
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anions of two  different elements  
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an anion and a  cation  
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cations of two  different elements  
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an anion and an  atom     Answer: A Explanatio n:  Isoelectro nic species  are those  which  contain  the same  number of  electrons.  Species  become  isoelectron ic when  they either  lose or  gain  electrons  from their  neutral  parent  atoms  (classic  example:  Na +  and  Mg 2+ which  both have  10  electrons,  like Ne).  Neutral  atoms of  different  elements  can never  have the  same  number of  electrons, because they have different numbers of protons in their nuclei, so if  they’re neutral, they have different numbers of electrons.   3
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The ion  represente d as  Ti 4 +  has:  
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3) 
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_______ 
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