NU FS100 Midterm: Midterm review

• School: University of Alberta
• Department: Nutrition and Food Sciences
• Course: NU FS100
• Professor: Wendy Wismer

Document Summary

Allotropes- two or more different physical forms in which an element can exist. Definite composition: compounds will be composed of the same fixed ratio no matter the source. Discovered electrons cathode ray tubes: cathode = negative, anode = positive milikans oil drop. Measured mass-charge ratio (discovered the charge on an electron) Atomic number (z)- number of protons=# of electrons. Mass number (a) number of protons & neutrons. Atomic symbol (x) -from the name of the element. Atomic mass unit (amu) = 1 dalton = 1. 66054x10^-24 g. 1 amu = 1/12 mass of carbon atom. 12 amu= 1 g of carbon: to find isotope mass of an element, 1. Find the ratio of its mass/ the mass of carbon 12: 2. X the ratio by mass of carbon (12 amu: 3. Metals: shiny, solid at room temp, conduct heat & electricity, ductile (stretched), malleable (thin sheets)