2: Topics in General Chemistry II
- Page ID
- 433168
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- 2.1: The Structure of Atoms
- Atoms are composed of three main subatomic particles: protons, neutrons, and electrons. Protons and neutrons are grouped together in the nucleus of an atom, while electrons orbit about the nucleus.
- 2.2: The Elements
- All matter is composed of elements. Chemical elements are represented by a one- or two-letter symbol.
- 2.3: Atomic Number and Mass Number
- Elements can be identified by their atomic number and mass number. Isotopes are atoms of the same element that have different mass number.
- 2.4: Atomic Weight
- Atoms have a mass that is based largely on the number of protons and neutrons in their nucleus.
- 2.5: The Periodic Table
- The chemical elements are arranged in a chart called the periodic table. Some characteristics of the elements are related to their position on the periodic table.
- 2.6: Valence Electrons and Electron Dot Formula
- The number of valence electrons for a main group element is the same as the group number of the element. This information is represented as electron dot structure.
- 2.7: The Mole and Mole-Mass Conversions
- Chemists use the term mole to represent a large number of atoms or molecules just as a dozen implies 12 things. Since the mole is a very large number, we use mass to keep track rather than by counting individual atoms.
- 2.8: Physical and Chemical Properties and Changes
- A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. A chemical property describes the ability of a substance to undergo a change to form new substances.
- 2.9: End of Chapter Problems
- This problem set is based on Chapter 2 topics.