AP Chemistry chapter 3

atomic mass unit. WHh is it necessary to introduce such a unit

It is a standard unit of mass equal to 1/12 of 1 C-12 Atom

it allows scientist to measure and compare the masses of atoms and molecules.

mass number

the whole number total of protons and neutrons in a single atom’s nucleus

atomic mass

the weighted average mass of all naturally occurring isotopes of an element

mole

the amount of a substance that contains exactly 6.022 × 10 ²3 elementry entities (atoms, molecules, or particles)

what does a mass spectromeetr do

dentitfies and quantifies compounds by seperating charged molecules based on their mass to charge ratio