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Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

Which element is the least metallic between cadmium, silver, zinc, or iron?

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum