ICSE

Position of hydrogen is still not satisfactory, as its properties relate to both Group 1 and Group 17 . It fails to accommodate the inner transition elements.

It is base on atomic number, which is an even better fundamental property compared to atomic mass. Position of an element in the table is related to its electronic configuration. It shows regular changes of elements on moving across the period or down a group. Modern periodic table is easier to remember , understand and …

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The third period elements , Na, Mg, Al, Si, P, S and Cl, summarize the properties of their respective group and are called typical elements.

There are four types of elements :- Representative elements Transition element Inner transition elements inert gases or noble gases

There are seven horizontal rows in the modern periodic table, each called a period .

Vertical colomns in the periodic table are called groups and the horizontal rows are called periods .

Properties that reappear at regular intervals, or in which their is gradual variations, i.e. increase or decrease at regular interval, are called Periodic properties

Periodic table is a chart of elements prepared in such a way that elements with similiar properties occur in the same group.

The reason for the classification of elements are :- It helps in studying the elements in an organized manner. It helps in correlatinng the properties of elements with the fundamental properties of all states of matter. It helps in defining the relationship of one element with another.