MTL 200 Lecture 2: Chapter 2

• School: Ryerson University
• Department: Mechanical Engineering
• Course: MTL 200
• Professor: Ahmad Varvani- Farahani

Document Summary

Atoms consist of: nucleus, protons, neutrons, electrons. It is the same as the number of electrons. The mass of protons + the mass of neutrons. Atoms of the same element that have the same number of protons and electrons, but have a different number of neutrons in the nucleus. Atomic the weighted average value of the atomic masses of an atoms naturally occurring isotopes. It may be expressed by the atomic mass unit per atom or the mass per mole. A measure of atomic mass using 1/12 (one twelfth) of the mass of an atom of carbon 12. The quantity of a substance corresponding to the avogadro"s number atoms or molecules. An early atomic model, in which the electrons are assumed to revolve around the atomic nucleus in discrete orbitals. The electron is considered to exhibit both wavelike and particle like characteristics. Indicates the shells the positon of the electrons.