3.1 Periodic table

3.1 Periodic table: The Modern Periodic Law helped to classify the elements.

The properties of elements are periodic function of increasing atomic number. 

The modern periodic table contains 18 vertical columns called groups and 7 horizontal rows called periods.

Elements in same groups possess similar chemical properties-Same number of valence electrons.

Group 1 is known as Alkali Metals,

Group 2 is known as Alkaline earth Metals,

Group 3-12 are Transition Metals,

Group 13 is known as Boron family,

Group 14 is known as Carbon family,

Group 15 is known as Nitrogen family,

Group 16 is known as Chalcogens

Group 17 is known as Halogens,

Group 18 is known as Noble gases/Inert gases

Physical and chemical properties are different across a period as the valence electrons are different across the period.

The elements possess the outermost electron in a particular subshell. 

Thus group 1 and 2 belong to “s” subshell and known as “s” block elements.

The group 3 to 12 belong to “d” subshell and known as “d” block elements.

The group 13 to 18 belong to “p” subshell and known as “p” block elements.

The elements in two separate horizontal tables belong to “f” subshell and known as “f” block elements. These elements are known as lanthanoids and actinoids.

Thus now you can answer questions on the 3.1 periodic table. You can get chemistry IA ideas here.

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