periodic classification of elements — Science STD 10 — Question
Gujarat BoardEnglish MediumSTD 10Scienceperiodic classification of elements4 Marks
Question
Write the general information of the modern periodic table.
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Answer
In $1913$, Henry Moseley showed that the atomic number of an element is a more fundamental property than its atomic mass.
Accordingly, 'Mendeleev's periodic law' was modified to 'Modern periodic law' and atomic number was adopted as basis to form modern periodic table.
Modern periodic law :
"Properties of elements are a periodic function of their atomic number."
The atomic number of any element is equal to the number of protons in the nucleus of the atom.
In modern periodic table, elements are arranged in order of increasing atomic numbers, hence prediction of properties of elements could be made with more accuracy.
Modern periodic table accounted the all three limitations of Mendeleev's periodic table.
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