In the modern periodic table, the period indicates the value of:
- atomic number
- atomic mass
- principal quantum number
- azimuthal quantum number.
The Correct Option is C
Solution and Explanation
All you have to do is glance at the periodic table to comprehend it. Elements from various periods usually begin with the next number when writing their electronic structures, indicating an increase in the primary quantum number. Hence,the value of the principal quantum number (n) for the outermost shell or the valence shell indicates a period in the Modern periodic table.
Therefore, the correct option is (c): principal quantum number
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- H3PO2(aq) + 2CuSO4(aq) + 2 H2O(l) \(\rightarrow\) H3PO4(aq) + 2Cu(s) + H2SO4(aq)
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What inference do you draw about the behaviour of Ag+ and Cu2+ from these reactions?
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Concepts Used:
Classification of Elements & Periodicity in Properties
Since many elements were being discovered in the 19th century and the study of these elements individually was proving difficult, classification of elements was made necessary.
Classification by Johann Dobereiner - German chemist Johann Dobereiner classified certain elements on the basis of their similar properties in the groups of continuing - three elements each. These groups were called ‘triads’. In every triad, the atomic weight of the middle element was equal to the average of the atomic weights of the first and third elements.
Newlands Law of Octaves - The elements were arranged in increasing order of their atomic weights and found that every 8th element shows similarity with the 1st element.
Mendeleev’s Periodic Table - The arrangement of all 63 elements in rows or columns in order of their atomic weight was made by Mendeleev. He left some space for corresponding elements in his periodic table which were not even discovered till then. Although he predicted the properties of those elements through his periodic classification of elements.
Modern Periodic Law - The properties of the elements of the modern periodic law are periodic functions of their atomic numbers.