The radius of a niobium atom is 131 pm. How many niobium atoms would have to be laid side by side to span a distance of 1.47 mm?

Based on the equation and the information in the table, what is the enthalpy of the reaction?

What is the mass of each element in a 324.8 sample of co2

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