Write the number of periods and groups in modern period table. How does the metallic character of elements vary on moving left to right and down a group?Give reason to justify your answer.
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7 periods and 18 groups are there in modern periodic table. metallic character increases down the group and decreases across the period.
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*There are 18 vertical columns called groups.
*Horizontally there are 7 rows called periods.
*Metals are defined as substances which are electropositive in nature and non metals as electronegative in nature. In a periodic table from left to right METTALIC CHARACTER DECREASES & NON METTALIC CHARACTER INCREASES.
*On descending a group METTALIC CHARACTER DECREASES.
Eg: groups 14 & 15 begin with carbon and nitrogen which are non metals . The group end with lead & bismuth respectively which are metals. The oxides of the elements also become basic.
Hope this helps you out!
*Horizontally there are 7 rows called periods.
*Metals are defined as substances which are electropositive in nature and non metals as electronegative in nature. In a periodic table from left to right METTALIC CHARACTER DECREASES & NON METTALIC CHARACTER INCREASES.
*On descending a group METTALIC CHARACTER DECREASES.
Eg: groups 14 & 15 begin with carbon and nitrogen which are non metals . The group end with lead & bismuth respectively which are metals. The oxides of the elements also become basic.
Hope this helps you out!
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