How do you appreciate the contribution of Mendeleef for his proposals of periodicity of predicting the properties of missing elements and correction of atomic weights
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Dmitri Mendeleev published a periodic table of the chemical elements in 1869 based on properties that appeared with some regularity as he laid out the elements from lightest to heaviest.[1] When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that then-unknown elements existed with properties appropriate to fill those gaps. He named them eka-boron, eka-aluminium, eka-silicon, and eka-manganese, with respective atomic masses of 44, 68, 72, and 100.
Mendeleev's periodic table is an important step towards the forming of modern period table , while making the mendeleev's periodic table he taken into consideration the physical properties of elements. there atomic mass , Their oxide and hydride formulae , According him properties of elements are periodic function of there atomic masses , he also arranged the elements in increasing order of their atomic masses , for i.e earlier the weight of the weight of beryllium earlier was 14.09 later it was corrected to 9.4 and was placed before boron , this expect is important as per periodic table and it also also became possible for him to predict the masses of the element coming between two heavy element which were not discoverd till then and later he was also able to predict the properties of those elements such as eka - boron , eka - aluminium , eka - silicon etc with respective masses - 46 , 68 , 72 .