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  • Number of horizontal rows (period) and vertical columns (group) in Mendeleev's periodic table respectively are :Option: 1 7  and  

Number of horizontal rows (period) and vertical columns (group) in Mendeleev's periodic table respectively are :

Option: 1

7  and  9 


Option: 2

7 and 8 


Option: 3

6 and 9 


Option: 4

6 and 8


Answers (1)

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As we have learned

Mendeleev’s Periodic table -

MENDELEEV'S PERIODIC TABLE:

  1. Mendeleev's periodic law : The physical and chemical properties of elements are the periodic function of their atomic weight

  2. Characteristic of Mendeleef's periodic table :

    1. It is based on atomic weight

    2. 63 elements were known, noble gases were not discovered.

    3. He was the first scientist to classify the elements in a systematic manner i.e. in horizontal rows and in vertical columns.

    4. Horizontal rows are called periods and there were 7 periods in Mendeleev's Periodic table.

    5. Vertical columns are called groups and there were 8 groups in Mendeleev's Periodic table.

    6. 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.

    7. The VIIIth group was consists of 9 elements in three rows (Transitional metals group).

    8. The elements belonging to the same group exhibit similar properties.

-

 mendelev's periodic table have 7 periods and 8 groups 

 

Posted by

Anam Khan

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