Tag: the periodic table

Questions Related to the periodic table

How many elements were known when Mendeleev presented the periodic table?

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. 63

  2. 80

  3. 93

  4. 102

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Correct Option: A
Explanation:
63 elements were known during the time of the introduction of the Mendeleev periodic table.

During Mendeleev's work, only 63 elements were known.

Option A is correct.

Mark the group which has maximum number of element in Mendeleev's periodic table:

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. $I$

  2. $II$

  3. $III$

  4. $IV$

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Correct Option: A

Eka-aluminum and Eka-silicon are known as:

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. gallium and germanium

  2. aluminium and silicon

  3. iron and sulphur

  4. sodium and silicon

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Correct Option: A
Explanation:

Answer A

According to Mendeleev he named eka aluminium presently known as Gallium
and eka silicon presently known as Germanium.

The Mendeleev's periodic table consists of groups: 

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. seven

  2. eight

  3. nine

  4. ten

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Correct Option: B
Explanation:
Eight groups were there in the Mendeleev's periodic table.

Mendeleev divided his periodic table in eight groups and seven periods.

Option B is correct.

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.