Mendeleev's Periodic Table

The places that were left empty by Mendeleev's were, for:

Which scientist first proposed the periodic table of elements? 

Which of the following element could not find a fixed place in Mendeleev's periodic table?

_____ were not included in Mendeleev's periodic table.

The number of periods present in Mendeleev's Periodic table is:

The elements in Mendeleev's periodic table are arranged on the basis of:

Which of the following, differ in the chemical properties?

Which of the following statement are incorrect regarding Mendeleev's periodic table?

(a) Mendeleev considered compounds formed by elements with oxygen and hydrogen.

(b) In the table Ni is placed before Co

(c) Eka-silicon in Mendeleev's periodic table is gallium

(d) The properties of the elements are periodic functions of their atomic masses.

An element $\mathrm{X}$ form an oxide ${\mathrm{X}}_2{\mathrm{O}}_3$. In which group of Mendeleev's periodic table, is this element $\mathrm{X}$.

$14$ elements after actinium is called

The number of elements present in the fifth period of modem periodic table is

Group 2 elements are collectively called

The numbers of periods are

The properties of eka-aluminum resembles

According to the Mendeleev periodic law, the
physical and chemical properties of elements
are periodic function of their

Choose the element which behaves both as metal and nonmetal chemically

Eka boron has properties similar to that of _____.

What are the properties of eka boron?

Eka boron has similar properties as that of scandium.

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