Tag: the periodic table

Mendeleev’s Periodic table says that the periodic function of their relative atomic masses. Mendeleev arranged all the 63 elements in it. These only were discovered in his time. These are in the order of their increasing relative atomic masses in a tabular form. It is the Periodic Table. He had the table with eight columns and seven rows. The columns are the groups whereas rows are the periods.

Hence, the correct option is A.

After the rejection of Newlands Octave Law, Mendeleev Periodic table came into existence. In Mendeleev’s periodic table, elements were placed based on the atomic mass, and chemical properties. During Mendeleev’s work, only 63 elements were found. After studying the properties of all elements, he found that the properties of elements were related to atomic mass.

Hence, the correct option is C.

In 1869, Dmitri Mendeleev and Lothar Meyer individually came up with their own periodic law "when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically." 

The elements selected by Mendeleev were oxygen and hydrogen because most of the elements reacted with oxygen and hydrogen.

The eight group in Mendeleev's periodic table was not divided into any group. It contained transition series elements.

The name given to the element, by Mendeleev, similar to Germanium in properties was Eka-Silicon.

The name given to the element, by Mendeleev, similar to Scandium in properties was Eka-Boron.

The groups from $1$st to $7$th of Mendeleev's periodic table were divided into two subgroups A and B.

The properties of Eka-aluminium are similar to gallium so it forms oxide of the type $E _2O _3$ same as $Ga _2O _3$.

The properties of Eka-aluminium are similar to gallium so it forms chloride of the type $ECl _3$ same as $GaCl _3$.