Describe the motion of the particles in salt while in the solid state of matter compared to when they are in the liquid state

Which of these conditions most likely produces an unstable isotope?

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)