Question

classification of elememts in periodic table​

Answer 1

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The discovery of the periodic recurrence of similar properties among the elements led to the formulation of the periodic table, in which the elements are arranged in order of increasing atomic number in rows known as periods and columns known as groups. Elements in the same group of the periodic table have similar chemical properties. Elements can be classified as metals, metalloids, and nonmetals, or as a main-group elements, transition metals, and inner transition metals. Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.

Answer 2

Explanation:

=>Periodic Classification of Elements Characteristics

In the long form periodic table the elements are arranged in the order of their atomic numbers. Atomic number of an element is equal to the number of protons inside the nucleus of its atom.

The general features of the long form periodic table are:

There are in all, 18 vertical columns and 18 groups in the long form periodic table.

These groups are numbered from 1 to 18 starting from the left.

There are seven horizontal rows called periods in the long form periodic table. Thus, there are seven periods in the long form periodic table.

The elements of Groups 1, 2 and 13 to 17 are called the main group elements. These are also called typical or representative or normal elements.

The elements of Groups 3 to 12 are called transition elements.

Elements with atomic number 58 to 71 (Ce to Lu) occurring after lanthanum (La) are called lanthanides.

Elements with atomic numbers 90 to 103 (Th to Lw) are called actinides. These elements are called f-block elements and also as inner transition elements.