Question

periodic classification of elements​

Answer 1

Explanation:

• Periodic classification of elements is the method by which elements are grouped on the basis of their characteristics i.e. we keep the elements that are alike in one group and the rest of the elements in the other group.

Answer 2

Answer:

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 actinoides. These elements are called f-block elements and also as inner transition elements.

Today we study the elements with the help of the modern periodic table. Periodic classification of elements is the method by which elements are grouped on the basis of their characteristics i.e. we keep the elements that are alike in one group and the rest of the elements in the other group. Some empty spaces have been left in the periodic table so that the elements that will be discovered in the future can be placed without disturbing the trending periodicity of the elements.