Question

what is mean by periodicity? write the cause of periodicity​

Answer 1

Answer:

The cause of periodicity in properties is the repetition of similar outer electronic configuration after certain regular intervals.

For example, all the elements of group IA i.e., alkali metals, have similar outer electronic configuration as ns

1

, where n refers to the number of outermost principal shell.

In a similar manner all the halogens i.e., elements of group VIIA have similar other electronic configurations i.e., ns

2

, np

7

and hence possess similar properties.

Due to similar outer electronic configurations, the properties of elements are also similar and hence they show periodicity.

Answer 2

Answer:

❣️Periodicity is the fact of something happening at regularly-spaced periods of time. ❣️

️️

Explanation:

❣️The cause of periodicity is the recurrence of similar electronic configuration i.e. same number of electrons in the outermost orbit.In a particular group, electrons in the outermost orbit remain the same i.e. electronic configuration is similar.❣️