What is the electronegativity difference
between sodium and chlorine?

What are the 4 phases of matter in order of increasing engery content?

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

What is a number added in front of a formula in order to balance the equation