The s and p sublevels of an atom of an element in period 3 are filled with electrons. which orbitals are filled in this atom?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

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 difference between a mixture of elements and a mixture of compounds