Chemistry PERIODIC CLASSIFICATION OF ELEMENTS Part-3

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PERIODIC CLASSIFICATION OF ELEMENTS Part-3

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Modern Periodic Table

`=>` In 1913, Henry Moseley, an English physicist discovered that the atomic number and not the atomic mass is the most fundamental property of an element.

`=>` Atomic number (Z) of an element is the number of protons in the nucleus of its atom.

`=>` The modern periodic law states that physical properties of elements are periodic functions of their atomic numbers, i.e. if elements are arranged in the order of their increasing atomic number, the elements with similar properties are repeated after certain regular intervals.

`=>` The periodic table based on the Modern Periodic Law is called the Modem Periodic Table. Presently, the accepted modem periodic table is the Long Form of Periodic Table.

`=>` In 1913, Henry Moseley, an English physicist discovered that the atomic number and not the atomic mass is the most fundamental property of an element.

`=>` Atomic number (Z) of an element is the number of protons in the nucleus of its atom.

`=>` The modern periodic law states that physical properties of elements are periodic functions of their atomic numbers, i.e. if elements are arranged in the order of their increasing atomic number, the elements with similar properties are repeated after certain regular intervals.

`=>` The periodic table based on the Modern Periodic Law is called the Modem Periodic Table. Presently, the accepted modem periodic table is the Long Form of Periodic Table.

Characteristics of Long Form of Periodic Table

`=>` The horizontal rows are called periods and the vertical columns are called groups.
`=>` The groups are numbered from 1 to 18 and there are altogether 7 periods.
`=>` Elements having similar outer electronic configurations in their atoms are arranged in the vertical columns, i.e., groups or families. That's why elements of a group possess similar chemical properties.
`=>` The period number corresponds to the highest principal quantum number (n) of the elements in the period and each period marks a new electronic shell getting filled .
`=>` The first period contains 2 elements and the subsequent periods consist of 8, 8, 18, 18 and 32 elements respectively and seventh period is incomplete
`=>` In this form of the periodic table, 14 elements of both six and seventh periods (lanthanoids and actinoids respectively) are placed in separate panels at the bottom.
`=>` For the main group elements, the number of group is the number of electrons in the outer shell.

`=>` The horizontal rows are called periods and the vertical columns are called groups.
`=>` The groups are numbered from 1 to 18 and there are altogether 7 periods.
`=>` Elements having similar outer electronic configurations in their atoms are arranged in the vertical columns, i.e., groups or families. That's why elements of a group possess similar chemical properties.
`=>` The period number corresponds to the highest principal quantum number (n) of the elements in the period and each period marks a new electronic shell getting filled .
`=>` The first period contains 2 elements and the subsequent periods consist of 8, 8, 18, 18 and 32 elements respectively and seventh period is incomplete
`=>` In this form of the periodic table, 14 elements of both six and seventh periods (lanthanoids and actinoids respectively) are placed in separate panels at the bottom.
`=>` For the main group elements, the number of group is the number of electrons in the outer shell.

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