CHM 1311 Study Guide - Deuterium, Antoine Lavoisier, Working Mass
Document Summary
Chemistry chapter 2 notes: atoms & atomic theory. Mass before reaction = mass after reaction. All matter is made of small, indivisible particles called, atoms . Atoms of the same element are identical in mass and other properties, atoms of different elements are different. Atoms of different elements combine in simple, whole number ratios, (e. g. 1:1 as in ab; or. Chemical reactions result in separation, combination, or rearrangement of atoms, but do not result in creation or destruction of atoms. Thompson atoms contain negatively charged electrons. Rutherford atoms contain a positively charged nucleus. The heaviest atoms has a mass of only 4. 8 x 10-22 g, and a diameter of only 5 x 10-10 m. 1 amu, (atomic mass unit) = 1. 66054 x 10-24 g. 1 pm, (pictometer) = 1 x 10-10 m = 100 pm = 1 x 10-8 cm. Top subscript = mass # = # of protons - # of neutrons.
