Chemistry

Periodic Classification and Elements

1,092 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

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

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 - $\text{Sc}$

  1. b, c

  2. a, b, d

  3. a, d

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
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 $\text{D}$
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.

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

  1. Copper

  2. Iron

  3. Zinc

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

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

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 a defect in the Mendleev's periodic table?

  1. Prediction of new elements

  2. Doubtful atomic weights

  3. Anomalous position of hydrogen

  4. Non-systematic study of elements
Reveal answer Fill a bubble to check yourself
C Correct answer
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).

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

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.

  1. True,True

  2. True, False

  3. False, True

  4. False, False
Reveal answer Fill a bubble to check yourself
D Correct answer
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.