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The Telluric Helix (La Vis Tellurique) was the first of the periodic system of the elements, conceived as a spiral wound round a cylinder.

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Important Questions on Classification of Elements and Periodicity in Properties

MEDIUM
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Which one of the following statements for D.I. Mendeleev, is incorrect ?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Which of the following is a metalloid?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
The atomic number of the element unnilennium is :
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table

Identify the incorrect match.

Name IUPAC Official Name
(a) Unnilunium (i) Mendelevium
(b) Unniltrium (ii) Lawrencium
(c) Unnilhexium (iii) Seaborgium
(d) Unununium (iv) Darmstadtium
MEDIUM
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
State two limitations of the Mendeleev's periodic table.
EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Eka-aluminium and Eka-silicon are known as
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table

What type of oxide would Eka-aluminium form?

HARD
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Dissimilar elements have been placed in the same group in the Mendeleev's periodic table ? Comment.
EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
The most significant contribution towards the development of periodic table was made by
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
In Mendeleev table, the triad of VIII group is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Where would you find in a period, the element with the least metallic character
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Mendeleev's periodic table is based on:
MEDIUM
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
The number of elements known when Mendeleev presented periodic table is
MEDIUM
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Before modern periodic law, the classification of elements was done on the basis of which property?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Anomalous pair in Mendeleev's table is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
In the modern periodic table, find examples for violation in Mendeleev's periodic law that the chemical and the physical properties of the elements are periodic function of their atomic weight.
HARD
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Eka-aluminium and Eka-silicon are known as
MEDIUM
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
State Mendeleev's periodic law. Write two achievements of Mendeleev's periodic table.
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of The Development of Periodic Table
Cotyledons are also called-