Clouds with extremely cool water are mixed with man-made ice crystals, such as silver iodide and metaldehyde crystals.

VOA: special.2011.01.11

If you look at the electronegativity difference 73 for sodium iodide, it is 1.73.

如果你看到电负性之差,对碘化钠来说，是1。

麻省理工公开课 - 固态化学导论课程节选

If you look at the electronegativity difference 73 for sodium iodide, it is 1.73.

如果你看到电负性之差,对碘化钠来说，是1。

麻省理工公开课 - 固态化学导论课程节选