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                                    Some Basic Concepts of Chemistry 51element, X has the following isotopicmposition, 200X:90%; 199X:8.0%. 202X:2.0%e weighted average atomic mass of the naturallycurring element X is closest to[AIPMT (Prelims)-2007](2) 200 amu199 amu | 
                            
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Answer»  X-200.--> 90 (say)X-199 --> 8 (say)X-202. -->2(say)200*90+199*8+202*2/90+8+219996/100=199.96=200amu(approx) 199amu 199amu 199amu  | 
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