Making Order Out of Chaos - Mendeleev's Periodic Table

Which of the following elements have properties similar to that of eka boron?

Using Mendeleev's periodic table, predict the formula for the oxides of the following elements:

$\mathrm{K}, \mathrm{C}, \mathrm{Al}, \mathrm{Si}, \mathrm{Ba}$.

How could the modern periodic law remove various anomalies of Mendeleev's periodic table? Explain with examples.

Describe two anomalies of Mendeleev’s periodic classification of elements.

Would you place the two isotopes of chlorine, $\mathrm{Cl}-35$ and $\mathrm{Cl}-37$ in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer. 

In Mendeleev's periodic table, why was there no mention of noble gases like helium, neon, and argon?

Mendeleev's periodic table is based upon the atomic masses. This periodic table is upset by the fact that:

Identify the most basic oxide?

An element X (atomic number $17$) reacts with an element Y(atomic number $20$) to form a divalent halide.
What is the position of elements X and Y in the periodic table?

How many periods and groups are there in Mendeleev periodic table?

List some drawbacks of Mendeleev's periodic table.

Why is long form of the periodic table regarded better than Mendeleev's periodic table?

What are the main contributions of Mendeleev's classification towards the development of chemistry?

What is a period in a periodic table? How does the electronic configuration change in a period with increase in atomic number from left to right?

Though the atomic mass of cobalt ($58.9$) is greater than nickel ($58.7$), yet $\mathrm{Co}$ is placed before $\mathrm{Ni}$ in Mendeleev's periodic table. Why?

What are the defects in Mendeleev's periodic table? 

What are the advantages of Mendeleev's periodic table? 

In Mendeleev’s periodic table, hydrogen was supposed to be

Mendeleev left one gap under B and Al, for an element, which was discovered later on. This element was:

P, Q and R are the elements of a Dobereiner's triad. What should be the atomic mass of Q, if the atomic mass of P is $7$ and that of R is $39$?.