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                                    The electronic configurations of three elements X, Y, and Z are as follows:X=2,4Y=2,7Z=2,1(a) Which two elements will combine to form an ionic compound?(b) Which two elements will react to form a covalent compound?Give reasons for your choice. | 
                            
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Answer»   The electronic configurations of three elements X, Y, and Z are as follows: Y=2,7 Z=2,1 
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