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Q. Assertion (A) Most of the space in the atoms is empty.
Reason (R) Most of the $\alpha$-particles passed through the foil remain undeflected.

Structure of Atom

Solution:

Most of the $\alpha$-particles passed through the foil remain undeflected as most of the space in the atoms is empty.
Thus, both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.