Question

Mendeleves periodic classification

Answer 1

Answer:

Mendeleev arranged all 63 elements; which were discovered till his time; in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev’s Periodic Table. He divided the table in eight columns and seven rows. The columns are known as groups and rows are known as periods.

Answer 2

Mendeleev's Periodic Classification:

• Mendeleev’s Periodic Law states that the properties of elements are the periodic function of their relative atomic masses.

• Mendeleev arranged all 63 elements; which were discovered till his time; in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev’s Periodic Table. He divided the table in eight columns and seven rows. The columns are known as groups and rows are known as periods.

Explanation of Mendeleev’s Periodic Table:

• Elements are arranged in the periodic table in the increasing order of their relative atomic masses.

• Mendeleev divided his periodic table in eight groups and seven periods.

• Groups from I to VII are meant for normal elements and group VIII is for transition elements.

• Groups from I to VII have been divided in two sub groups, while group VIII is meant for three elements.

• Periods from 4th to 7th have been divided in two series: 1st series and 2nd series.

• Elements having similar properties have been kept in the same group. For example; lithium, potassium, rubidium, etc. are in 1st group.

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