Tag: mendeleev's periodic law and its limitations

Questions Related to mendeleev's periodic law and its limitations

Which element was named Eka-aluminium by Mendeleev?

chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

  1. Scandium

  2. Gallium

  3. Germanium

  4. Indium

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Correct Option: B

The basis of periodic law presented by Mendeleev was: 

chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

  1. valency

  2. atomic mass

  3. atomic number

  4. atomic volume

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Correct Option: B
Explanation:

He grouped the elements with similar properties and observed that elements were arranged in the increasing order of atomic mass and there was the periodic occurrence of elements with similar properties.

According to this observation, he formulated a periodic law which states:

“the properties of elements are the periodic function of their atomic masses.”

Option B is correct.

In Mendeleev's periodic table few elements that are chemically similar are placed in the same groups.

chemistry periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

  1. True

  2. False

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Correct Option: A
Explanation:

Mendeleev arranged the elements having similar configuration placed in the vertical columns as they will have the same unpaired electrons hence reflecting the similar properties. In Mendeleev's periodic table few elements that are chemically similar are placed in separate groups.

The horizontal rows in Mendleev's table were called :

chemistry periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

  1. groups

  2. rows

  3. periods

  4. none of the above

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Correct Option: C
Explanation:

The horizontal rows in Mendleev's table were called periods. There are seven periods in Mendeleev's periodic table.

The vertical columns in Mendeleev's table were called :

chemistry periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

  1. verticals

  2. periods

  3. columns

  4. groups

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Correct Option: D
Explanation:

The vertical columns in Mendeleev's table were called groups. There are $8$ groups in Mendeleev's periodic table.