Tag: the periodic table

Questions Related to the periodic table

Which of the following is incorrect statement about Mendeleev's classification of elements?

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. He could classify all the elements including noble gases.

  2. He left gaps for some yet to be discovered elements.

  3. He predicted the properties of some undiscovered elements.

  4. There was no place for isotopes in his table.

Show answer
Correct Option: A
Explanation:

Mendeleev periodic table is based on atomic weights of elements,

$\left( \ast  \right) $ He left no place for isotopes in his table.
$\left( \ast  \right) $ Predicted the properties and left gaps for discovered elements.
$\left( \ast  \right) $ He could not classify all elements including noble gases.
Ans :- A.

Consider the following statements:
(a) The discovery of inert gases later on did not disturb Mendeleev's arrangement.
(b) In his classification of element, Mendeleev was guided proportional to two factors.
(c) In the present periodic table, periodicity in the properties of elements is related to the periodicity in their electronic configurations. 


Which of the above statement(s) is/are correct?

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. Only (a)

  2. Only (c)

  3. (a) and (b)

  4. (a), (b) and (c)

Show answer
Correct Option: D
Explanation:

a.)The discovery of inert gases, later on, did not disturb Mendeleev's arrangement as he made quite clear that the noble gas must reside in the periods of inert gases having their octet i.e.completely filled electrons in their valence shell.


b.)In the classification of elements, Mendeleev was guided proportional to by two factors which were their atomic voice and their chemical properties.

c.)In the present periodic table, periodicity in the properties of elements is related to the periodicity in their electronic configurations. 

Hence it is (a), (b) and (c)

Which of the following is the correct match?
(a) Eka silicon - $\text{Ge}$
(b) Eka aluminum - $\text{Ga}$
(c) Eka manganese - $\text{Tc}$
(d) Eka boron - $\text{Sc}$

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. b, c

  2. a, b, d

  3. a, d

  4. All of above

Show answer
Correct Option: D
Explanation:
Eka is a-prefix used to designate the first element of the same family in the periodic table beyond the one to whose name it is prefixed, as Eka manganese

(a) Eka silicon - Ge (germanium)

(b) Eka aluminium - Ga (gallium )

(c) Eka manganese - Tc (technetium) 

(d) Eka boron – Sc (scandium)

Hence, the correct option is $\text{D}$

Mendeleev's classified elements in:

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. Increasing order of atomic number

  2. Increasing order of atomic masses

  3. Decreasing order of atomic masses

  4. Decreasing order of atomic number

Show answer
Correct Option: B
Explanation:

Mendeleev's law
"the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights."

According to Mendleev's periodic law which properties of the elements are the periodic function of their atomic masses?

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. Physical properties

  2. Chemical properties

  3. Physical and chemical properties both

  4. None of these

Show answer
Correct Option: C
Explanation:

According to Mendeleev's periodic law physical and chemical properties both of the elements are the periodic function of their atomic masses

Which gases were unknown at the time of 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. Oxygen

  2. Noble gases

  3. $CO _2$

  4. None of the above

Show answer
Correct Option: B
Explanation:

The noble gases were unknown to Mendeleev. They were discovered later.

In Mendeleev's periodic table, the gap was not left for one of the following elements. This element 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. potassium

  2. beryllium

  3. germanium

  4. scandium

Show answer
Correct Option: B
Explanation:

In Mendeleev's periodic table, gap was not left for beryllium.

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. Mendleev

Show answer
Correct Option: D
Explanation:

In 1870 Mendeleev created a table or chart that listed the known elements according to increasing order of atomic weights and when he organized the table into horizontal rows elements with similar chemical properties appeared at regular intervals.

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. L. Meyer

  2. John AR. Newlands

  3. Dobernier

  4. D.l. Mendeleev

Show answer
Correct Option: D
Explanation:

Mendeleeve predicted several new elements and accurately predicted the qualities of missing elements like germanium,gallium and scandium. He arranged the elements in the table according to their atomic weight.

In Mendeleev's periodic table, gaps were left for the element to be discovered later on, which of the following elements found a place on the periodic table later on:

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. germanium

  2. chlorine

  3. silicon

  4. oxygen

Show answer
Correct Option: A
Explanation:

Out of the given options, Oxygen, Silicon and Chlorine were present. He also left gaps of elements to be discovered in future. One such gap was for germanium (Ge).