Tag: the periodic table

Questions Related to the periodic table

What type of oxide would Eka-aluminium form?

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. $EO _3$

  2. $E _3O _2$

  3. $E _2O _3$

  4. $EO$

Show answer
Correct Option: C
Explanation:

Eka- Aluminium (E) forms oxide with the same empirical formula is Aluminium oxide. Thus, it forms ${ E } _{ 2 }{ O } _{ 3 }$ oxide.


Hence, option C is correct.

Number of short periods in Mendeleev table is :

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. $2$

  2. $3$

  3. $4$

  4. $1$

Show answer
Correct Option: B
Explanation:

Period number 1, 2 and 3 contain 2, 8 and 8 elements respectively. Other periods contain more than 8 elements. Hence, the first three periods are called as short periods. So, total of 3 short periods are there in Mendeleev periodic table.

The properties of the elements, as well as the formulae and properties of their compounds, depend in a periodic manner on the atomic weights of the elements. This periodic law was given by:

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. J. Lothar Meyer

  2. John A.R. Newlands

  3. Dobernier

  4. D. I. Mendeleev

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Correct Option: D

The anomalous pairs in Mendeleev's periodic table is/are_______.

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. Co, Ni

  2. Te, I

  3. Ar, K

  4. All the above

Show answer
Correct Option: D
Explanation:

Anomalous pairs in mendeleev's periodic table are
`
Cu,Ni,Te,I,Ar,K

Anomalous pairs are of consecutive elements. Thus if we observe Mendeleev's periodic table, all the given options form anomalous pairs.

In the modified Mendeleev's  periodic table,____ group and_periods are present, whereas in the modern periodic table,groups and___periods are present, respectively:

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. 9, 8, 18, 7

  2. 7, 9, 18, 7

  3. 9, 7, 18, 8

  4. 8, 7, 18, 7

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Correct Option: D
Explanation:

In the modified Mendeleev's periodic table, 8 groups and 7 periods are present, whereas in modern periodic table, 18 groups and 7 periods are present, respectively.

According to Mendeleev's periodic table, one element whose atomic mass is greater than that of nickel is placed before Nickel. Name the element:

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. Copper

  2. Iron

  3. Zinc

  4. Cobalt

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Correct Option: D
Explanation:

Cobalt was placed before nickel despite having atomic mass greater than that of nickel to maintain the periodicity in chemical properties.

Which of the following is a defect in the Mendleev'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. Prediction of new elements

  2. Doubtful atomic weights

  3. Anomalous position of hydrogen

  4. Non-systematic study of elements

Show answer
Correct Option: C
Explanation:

Position of hydrogen was not right in the Mendleevs' periodic table. It was placed in IA. However, it resembles the elements of both IA(alkali metals) and group VII A (halogens).

State true or false.
1. Position of isotopes was clearly defined in Mendleev's periodic table.
2. Position of lanthanides and actinides was clearly defined in Mendleev'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. True,True

  2. True, False

  3. False, True

  4. False, False

Show answer
Correct Option: D
Explanation:

Since, Mendeleev's classification is based on atomic weights, position of isotopes was not given. Lanthanides and Actinides were not known at that time. Their position has not been defined in the periodic table.

Among the following, which are not given a proper place in 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. Alkali earth metals

  2. Lanthanides

  3. Actinides

  4. Both B and C

Show answer
Correct Option: D
Explanation:

Fourteen elements that follow lanthanum called lanthanides and fourteen elements following actinium called actinides were not given proper places in Modern  periodic table.

Which of the following are the demerits of Mendeleev 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. No proper position for hydrogen is given.

  2. Grouping of chemically dissimilar elements.

  3. Position given to isotopes.

  4. Presence of anomalous pairs.

Show answer
Correct Option: A,B,C,D
Explanation:
1. Mendeleev could not assign a correct position to hydrogen in the periodic table as hydrogen resembles alkali metals as well as halogens.
2.     Isotopes had to be given the same position in the periodic table though isotopes of the same elements have different atomic masses. 
3.  It was observed that at certain places, an element of higher atomic mass Cobalt (Co=58.93) has been placed before an element of lower atomic mass Nickel (Ni = 58.71).
4. Some elements placed in the same sub - group varies in their properties. Manganese is placed with halogens which totally differ in the properties.