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Modern Periodic Law

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The problem with elements being arranged in the increasing order of atomic masses is that the atomic mass does not increase in a regular manner in going from one element to next. So, it is not possible to predict how many elements could be discovered between the elements. This is why in the Modern Periodic Table elements are arranged according to their ___.

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Solution

Elements, when arranged in order of increasing atomic number Z, leads us to the classification known as the Modern Periodic Table. Prediction of properties of elements could be made with more precision when elements were arranged on the basis of increasing atomic number.

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Q. The problem with elements being arranged in the increasing order of atomic masses is that the atomic mass does not increase in a regular manner in going from one element to next. So, it is not possible to predict how many elements could be discovered between the elements. This is why in the Modern Periodic Table elements are arranged according to their ___.

Why should elements in periodic table be arranged in increasing order of atomic no. And not atomic mass.

Q. The elements in the Mendeleev’s periodic table were arranged in the increasing order of their atomic masses. But, the sequence was inverted so that two elements with similar properties could be grouped together. Identify those two elements.

Q. According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of:

(a) decreasing atomic numbers
(b) increasing atomic numbers
(c) decreasing atomic masses
(d) increasing atomic masses

In the modern periodic table, the elements are arranged on the basis of their increasing atomic number.

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