Chemistry

Periodic Classification and Elements

1,176 Questions

Periodic classification organizes chemical elements based on atomic structure, periodic laws, and elemental properties. It covers historical classification systems, electron configurations, and periodic trends. Test takers preparing for chemistry sections will find these questions crucial for mastering fundamental element properties and atomic interactions.

Periodic table structureAtomic orbitalsElement identificationPeriodic laws

Periodic Classification and Elements Questions

Multiple choice 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

Which among the following is not an anomalous pair in Mendeleev's periodic table?

  1. Co, Ni

  2. Te, I

  3. Ar, K

  4. Sc, Ga
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In certain pair of elements, the increasing order of atomic masses was not obeyed. 


In these, Mendeleev placed elements according to similarities in their properties and not in increasing order of their atomic masses.

 The last pair is not anomalous pair.

Option D is correct.

Multiple choice 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

The first element of a group in many ways differs from the other heavier members of the group. This is due to:

  1. the small size

  2. the high electronegativity and high ionisation potential

  3. the unavailability of d-orbitals

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

1st element of a group, have smaller size and high IP, also they dont have d-orbitals so they show different properties like valency, ionic character, maximum valency solubility.

Multiple choice 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

Write the correct alternatives :
According to Mendeleev's periodic law, properties of elements are periodic function of their...............

  1. Atomic number

  2. Atomic masses

  3. Densities

  4. Boiling points
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to Mendeleev's law, the physical and chemical properties of element are the periodic function of their atomic weights . (atomic masses)


$\therefore$ option "B" is correct.

Multiple choice 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

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

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice 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

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?

  1. Only (a)

  2. Only (c)

  3. (a) and (b)

  4. (a), (b) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
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)

Multiple choice 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

Mendeleev's classified elements in:

  1. Increasing order of atomic number

  2. Increasing order of atomic masses

  3. Decreasing order of atomic masses

  4. Decreasing order of atomic number
Reveal answer Fill a bubble to check yourself
B Correct answer
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."

Multiple choice 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

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

  1. Physical properties

  2. Chemical properties

  3. Physical and chemical properties both

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

Multiple choice 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

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 :

  1. J. Lothar Meyer

  2. John A. R. Newlands

  3. Dobernier

  4. D.I. Mendleev
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice 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

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__________.

  1. J. L. Meyer

  2. John AR. Newlands

  3. Dobernier

  4. D.l. Mendeleev
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice 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

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:

  1. germanium

  2. chlorine

  3. silicon

  4. oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
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).

Multiple choice 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

Number of short periods in Mendeleev table is :

  1. $2$
  2. $3$
  3. $4$
  4. $1$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice 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

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:

  1. J. Lothar Meyer

  2. John A.R. Newlands

  3. Dobernier

  4. D. I. Mendeleev
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dmitri Mendeleev formulated the periodic law stating that the properties of elements are a periodic function of their atomic weights.

Multiple choice 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

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

  1. Co, Ni

  2. Te, I

  3. Ar, K

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice 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

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

  1. 9, 8, 18, 7

  2. 7, 9, 18, 7

  3. 9, 7, 18, 8

  4. 8, 7, 18, 7
Reveal answer Fill a bubble to check yourself
D Correct answer
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.