Practice: PRACTICE: Determine the number of protons, neutrons and electrons in the following atoms.
Been awhile since Chem 1? Let’s cover some of the essentials from general chemistry that you’ll need for this course.
Recap of Protons and Neutrons
Concept #1: The difference between atomic numbers and atomic mass.
- Atomic Number: Number of protons in the atom.
- Atomic Mass: Total number of protons and neutrons in the atom.
- Isotopes: Atoms that have the same atomic number but differing atomic mass.
Example #1: Understanding the hydrogen isotopes.
Recap of Electrons
Concept #2: Shells, orbitals and types of ions
- Shell: Region of space that electrons orbit around the nucleus in.
- Orbital: Region of space within a shell with exactly enough space for two electrons.
- Ion: An atom that has an unequal number of electrons and protons.
Example #2: Understanding the hydrogen ions.
The Three Principles of Electron Configuration
Concept #3: 3 rules about orbitals you need to know.
Practice: PRACTICE: Determine the number of protons, neutrons and electrons in the following atoms.
Practice: PRACTICE: Determine which of the three principles of electron configuration is being broken in the electron diagrams below.
Practice: PRACTICE: Determine which of the three principles of electron configuration is being broken in the electron diagrams below.
