Question

What is periodic table? Write some notes helping and explaining about this.

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Answer 1

Answer:

The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right.

Answer 2

Answer:

• Periodic table is a systematic arrangement of elements in increasing order of atomic number.
• It has 7periods and 18groups.
• Modern periodic table is prepared by H.G.J Moseley.
• The periods represents number of shells of an element and group represents no.of valence electrons in an atom of an element.
• The elements in group I-A are known as alkali metals .
• The elements in group II-A are known as alkali earth metals .
• The elements in group VII-A are known as halogens.
• Hydrogen place is left anomalous in periodic table.
• Lanthanide and Actinide series are placed out of the periodic table.They are not accommodated in periodic table.