According to Mendeleev’s Periodic Law, the elements were arranged in the periodic table in the order of:
A
increasing atomic number
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B
decreasing atomic number
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C
increasing atomic masses
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D
decreasing atomic masses
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Solution
The correct option is C
increasing atomic masses
Explanation:
Mendeleev’s periodic table:
Mendeleev’s periodic table is an arrangement of elements in an increasing atomic mass order in a tablet form, such that it reflects similarities and trends in the behaviour of elements.
Mendeleev’s periodic table can be understood better by reversing the arrangement of the elements.
Here elements are, arranged in increasing order of atomic mass, in a horizontal line.
This horizontal arrangement of elements is a ‘period’.
When an element has high similarity to an earlier element, the new element is, placed just below the earlier element having similar properties to start a new period.
The period’s one below the other form a ‘column’ (group). Thus, Mendeleev’s periodic table consists of horizontal rows and vertical columns or periods and groups, respectively.
If the element is similar but not very much, it is, placed below but slightly away to differentiate it. Each column will have two sub-columns (A and B) such that elements in the same sub-columns show more resemblance.
According to Mendeleev’s ′ Periodic Law, the elements were arranged in the periodic table in the order of increasing atomic masses.