what sre the some more examples of anomalous pairs of mendleev’s periodic table???

@ mahak 
mandaleev classified the elements as their periodic function of atomic masses , 
his periodic table fails due to the following factors . 
1- position of hydrogen – its property will be resemble of halogen , but its placed alongwith the 1a alkali metals . 
2- position of isotopes – they aree atoms of same element having diffrent masses , so, acc to mandaleev , they should place in diff places acc to their atomic masses , but isotopes has not given separate places for that . 
3- anomalous pair of elemnt – in certain pair of elemnt , the increasing order of atomic masses are not obeyed , in these mandaleev place elemnts acc to the simmilarity in the properties , and not in the increasing order of atomic masses . 
example – POTASSIUM AND ARGON , TELLURIUM AND IODINE . 

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