What Are the Main Features of Mendeleev’S Periodic Table? - Science and Technology 1

Short Note

What are the main features of Mendeleev’s periodic table?



Main features of Mendeleev’s periodic table :
(i) The horizontal rows in the periodic table are called periods. There are seven periods. These are numbered from 1 to 7.
(ii) Properties of elements in a particular period show regular gradation from left to right.
(iii) Vertical columns in the periodic table are called groups. There are eight groups numbered from I to VIII. Groups I to VII are further divided into A and B  subgroups.

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2015-2016 (March)



Name three elements that have a single electron in their outermost shells.

Name three elements with filled outermost shells.

State any three demerits of Mendeleev’s periodic table.

Why is atomic number considered to be a more appropriate parameter than atomic mass for the classification of elements in a periodic table? How does the metallic character of elements vary as we move (i) from left to right in a period, and (ii) top to bottom in a group in the modern periodic table? Give reasons to justify your answers.



The atomic number of an element is 12.  (3)

(a) Write its electronic configuration and determine its valency.

(b) Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer giving reason.

(c) Is it a metal or a non-metal?

(d) Write the formula of its oxide.


Explain in brief how Mendel interpreted his results to show that the traits may be dominant or recessive.

Write a short note.
Mendeleev’s periodic law.

Write the merits of Mendeleev’s periodic table.

Mendeleev's contributions to the concept of a periodic table laid the foundation for the Modern Periodic Table. Give reasons.

Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.

Why did Mendeleev's leave some gaps in his periodic table os elements? Explain your answer with an example.

Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.

How many elements were known at the time of Mendeleev's classification of elements?

Answer the following question:

Name two elements having a single electron in their outermost shell. 

What are the demerits of Mendeleev’s periodic table?

How did Mendeleev arrange the elements in the periodic table?

What was the basis of Mendeleev's classification?

How did Mendeleev's arrangement of elements correlate with the periodicity of the properties of elements?

State the contributions made by Mendeleev towards the periodic table.

What were the defects and anomalies in Mendeleev's Periodic Table and how are they resolved by Moseley?

According to Mendeleev’s periodic law, properties of elements are periodic function of their _______.

At the time of Mendeleev _______ elements were known.

In Mendeleev’s periodic table eka- silicon was later named as _______.

Beryllium : alkaline earth metal : : sodium: _______

Write the molecular formula of the oxide of any one of the elements in Mendeleev’s periodic table.

Which two elements show an ambiguity regarding their sequence in Mendeleev’s periodic table?

According to Mendeleev’s periodic law properties of elements are ______.

While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.

Write scientific reason.

Mendeleev kept vacant places in the periodic table.

Write scientific reason.

There was no definitive place for isotope in Mendeleev’s periodic table.

State Mendeleev’s Periodic Law.

Distinguish between:

Mendeleev’s periodic table - Modern periodic table

On which basis Mendeleev organised periodic law?

What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table?

What challenges did Mendeleev face in following periodic law?

What are the limitations of Mendeleev's periodic table?

Which of the following oxide is most basic?

Which of the following are the characteristics of isotopes of an element?

(i) Isotopes of an element have the same atomic masses
(ii) Isotopes of an element have the same atomic number
(iii) Isotopes of an element show the same physical properties
(iv) Isotopes of an element show the same chemical properties

In Mendeléev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later

Mendeléev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.

  1. Name the elements which have taken the place of these elements
  2. Mention the group and the period of these elements in the Modern Periodic Table.
  3. Classify these elements as metals, non-metals or metalloids
  4. How many valence electrons are present in each one of them?

Which group of elements could be placed in Mendeléev's Periodic Table without disturbing the original order? Give reason.

State Mendeleev’s Law of Periodicity.

List the features of Mendeleev’s Periodic Table.

Mendeleev's periodic table was based on ______.


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