CHEM103 Lecture Notes - Lecture 1: Mass Number, Carbon-12, Atomic Number

• School: University of Alberta
• Department: Chemistry
• Course: CHEM103
• Professor: John Veinot

Document Summary

Mass number total number of protons and neutrons. Isotopes are the same element with different numbers of neutrons. Atomic symbol derived from element names in english, latin, and greek. Number of neutrons can be determined from subtracting the atomic number from the mass number of the element. One periodic table element square is in the following format: Isotopes of elements have different numbers of neutrons and therefore have different masses. Artificial isotopes are isotopes which do not occur naturally and are seen in nuclear decay or prepared in particle accelerators: carbon 9, 10, 11, 15, and 16 are such artificial isotopes. There are three natural isotopes of silicon: silicon 28 14 neutrons, silicon 29 15 neutrons, silicon 30 16 neutrons.