CHM 131 Chapter Notes - Chapter 2-3: Ferrous, Charged Particle Beam, Sodium Chloride
8 Sep 2015
School
Department
Course
Professor
Document Summary
Isotopes: have the same atomic number but different masses (most atoms will have more than one isotope such as hydrogen, 1h, 2h deuterium and 3h tritium). Isotopes of sodium: when an atom has a different number of neutrons such as a sodium atom having 11 protons with 11 neutrons or a sodium atom having 11 protons but 13 neutrons. Na is the name of the element, the lower subscript 11 will indicate the number of protons and the superscript tells us the total mass of the protons and the neutrons. Averaged atomic mass = the sum of the (atomic mass of isotope) times (the abundance p1) Protons and neutrons have the same mass (1. 67*10-27 kg) while the electron is much lighter, weighing only 9. 11 10 31 kg. A crystal arrangement means that the atoms are arranged and drawn in a 3-d model and are modeled according to the size of the atoms.
