Physics
According to Rutherford's atomic model, the electrons inside an atom are

Not Stationary
None of these
Centralized
Stationary

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

The density of salt solution exceeds the density of eggs
Water has high surface tension
Albumin dissolves in salt solution and egg becomes lighter
Egg absorbs salt from the solution and expands

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