CHEM 101 Chapter Notes - Chapter 1: Cathode Ray, Electric Field, Unified Atomic Mass Unit

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taupemouse395

23 Nov 2017

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Document Summary

Atomic weight: most elements in nature occur as mixtures of isotopes, atomic weight: average atomic mass of an element to determine atomic weight add the masses of the isotopes multiplied by their relative abundances. The periodic table: arrangement of elements is in order of increasing atomic number, with elements having similar properties placed in vertical columns, periods: horizontal rows, groups: vertical columns. Alkaline earth metals be, mg, ca, sr, ba, ra. He, ne, ar, kr, xe, rn: metals: elements on the left and in the middle of the table that share properties like luster, high electrical and heat conductivity, and are solid at room temperature (except mercury. Cl2: molecular compounds: compounds composed of molecules containing more than one type of atom. Ionic compounds in general, cations are metal ions and anions are nonmetal ions ionic compounds are generally combinations of metals and nonmetals ions in ionic compounds are arranged in three-dimensional structures no discrete.

Related Questions

In a series of experiments, a chemist prepared three different compounds that contain only iodine and fluorine and determined the mass of each element in each compound:

(a) Calculate the mass of fluorine per gram of iodine in each compound. (b) How do the numbers in part (a) support the atomic theory?

b) When all three numbers are divided with 0.15, it gives: 5, 3, and 7. So, F and I form compounds in constant, whole number ratios. This is a law of multiple proportions and goes along with Dalton’s atomic theory since the F and I atoms combine in known ratios, and the masses of atoms are constant.