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Aufbau Principle

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Question

What is the reason for Periodicity in properties ?

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Solution

The cause of periodicity of properties of elements is due to the repetition of similar electronic configuration of their atoms in the outermost energy shell after certain regular interval.

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Q. What is periodicity in properties of elements with reference to the Modern Periodic Table ? Why do all the elements of the same group have similar properties ? How does the tendency of elements to gain electrons change as we move from left to right in a period ? State the reason of this change.

Q. Assertion: Elements in the same column have similar properties.
Reason: Periodic properties of elements is a function of atomic number.

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