Number 28 please with work shown or formula

Which statement describes james chadwick’s discovery.

In pqr m< p=60 m< q= 30 and m

Substance a is a nonpolar liquid and has only dispersion forces among its constituent particles. substance b is also a nonpolar liquid and has about the same magnitude of dispersion forces among its constituent particles. when substance a and b are combined, they spontaneously mix.