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- Engineering
- Mendeleev’s periodic table is based on:Option: 1 Atomic numberOption: 2 Atomic weight
- #Chemistry
- #Classification of Elements and Periodic table
- #Joint Entrance Examination Main
- #Amrita Engineering Entrance Examination
- #Engineering
Mendeleev’s periodic table is based on:
Atomic number
Atomic weight
Ionization enthalpy
None of the above
Answers (1)
Mendeleev’s Periodic table -
MENDELEEV'S PERIODIC TABLE:
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Mendeleev's periodic law : The physical and chemical properties of elements are the periodic function of their atomic weight
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Characteristic of Mendeleef's periodic table :
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It is based on atomic weight
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63 elements were known, noble gases were not discovered.
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He was the first scientist to classify the elements in a systematic manner i.e. in horizontal rows and in vertical columns.
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Horizontal rows are called periods and there were 7 periods in Mendeleev's Periodic table.
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Vertical columns are called groups and there were 8 groups in Mendeleev's Periodic table.
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Each group upto VIIth is divided into A & B subgroups.'A' sub groups element are called normal elements and 'B' sub groups elements are called transition elements.
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The VIIIth group was consists of 9 elements in three rows (Transitional metals group).
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The elements belonging to the same group exhibit similar properties.
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Mendeleev arranged the elements in horizontal rows and vertical columns in his table in order of their increasing atomic weights. In this way, elements with similar properties, occupied the same vertical column.
Therefore, Option(2) is correct
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