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What is the number of columns in Mendeleev's Periodic table?

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Important Questions on Introduction to Chemistry

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The atomic number of the element unnilennium is :
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In Mendeleev table, the triad of VIII group is
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What type of oxide would Eka-aluminium form?

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Where would you find in a period, the element with the least metallic character
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Eka-aluminium and Eka-silicon are known as
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State two limitations of the Mendeleev's periodic table.
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Dissimilar elements have been placed in the same group in the Mendeleev's periodic table ? Comment.
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The most significant contribution towards the development of periodic table was made by
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Anomalous pair in Mendeleev's table is
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Before modern periodic law, the classification of elements was done on the basis of which property?
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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.
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Mendeleev's periodic table is based on:
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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}

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The number of elements known when Mendeleev presented periodic table is
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Science>Chemistry>Introduction to Chemistry>Notable Chemists
Eka-aluminium and Eka-silicon are known as
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State Mendeleev's periodic law. Write two achievements of Mendeleev's periodic table.
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Cotyledons are also called-
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The atomic weights of "Be" and "In" were corrected by Mendeleev using the formula
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Eka silicon is now called as
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Identify the term or substance based on the description given below.
Vertical arrangement of elements in the periodic table.