Ch 2: Atoms: Tutoring Solution

About This Chapter

The Atoms chapter of this College-Level General Chemistry Tutoring Solution is a flexible and affordable path to learning about atoms. These simple and fun video lessons are each about five minutes long and they teach all of the information involving atoms required in a typical college-level general chemistry course.

How it works:

  • Begin your assignment or other chemistry work.
  • Identify the atoms concepts that you're stuck on.
  • Find fun videos on the topics you need to understand.
  • Press play, watch and learn!
  • Complete the quizzes to test your understanding.
  • As needed, submit a question to one of our instructors for personalized support.

Who's it for?

This chapter of our college-level general chemistry tutoring solution will benefit any student who is trying to learn about atoms and earn better grades. This resource can help students including those who:

  • Struggle with understanding atomic and mass numbers, average atomic mass, electron configurations in atomic energy levels or any other atoms topic
  • Have limited time for studying
  • Want a cost effective way to supplement their science learning
  • Prefer learning science visually
  • Find themselves failing or close to failing their atoms unit
  • Cope with ADD or ADHD
  • Want to get ahead in chemistry
  • Don't have access to their science teacher outside of class

Why it works:

  • Engaging Tutors: We make learning atoms simple and fun.
  • Cost Efficient: For less than 20% of the cost of a private tutor, you'll have unlimited access 24/7.
  • Consistent High Quality: Unlike a live chemistry tutor, these video lessons are thoroughly reviewed.
  • Convenient: Imagine a tutor as portable as your laptop, tablet or smartphone. Learn atoms on the go!
  • Learn at Your Pace: You can pause and rewatch lessons as often as you'd like, until you master the material.

Learning Objectives

  • Learn how to determine the atomic number and mass number of an atom.
  • Explore early atomic theory.
  • Describe the relationship between isotopes and average atomic mass.
  • Understand the applications of Avogadro's number.
  • Write electron configurations for atoms of different elements.
  • Become familiar with the four quantum numbers.
  • Explain the relationship between the Bohr model and atomic spectra.

8 Lessons in Chapter 2: Atoms: Tutoring Solution
Test your knowledge with a 30-question chapter practice test
Atomic Number and Mass Number

1. Atomic Number and Mass Number

An atom is defined as the smallest particle of an element that displays the same properties of that element. Learn about the main components of an atom (protons, neutrons, & electrons), the characteristics of each component, and how to determine the atomic number and the mass number of an atom.

Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

2. Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

The current knowledge of atoms and atomic theory has been informed by many scientists going back to Aristotle and Democritus. Learn about the contributions made to early atomic theory by scientists working in more recent times, such as Dalton, Thomson, Rutherford, and Millikan.

Isotopes and Average Atomic Mass

3. Isotopes and Average Atomic Mass

Isotopes are variations of the same element with differing numbers of neutrons and, subsequently, different atomic masses. Learn how scientists consider isotopes when they calculate average atomic mass.

Avogadro's Number: Using the Mole to Count Atoms

4. Avogadro's Number: Using the Mole to Count Atoms

Atoms are microscopic and challenging to count as a result. Learn about the importance of understanding the mole, which is simply a large number or quantity of something, also known as Avogadro's number, and how it helps scientists count large numbers of atoms.

Electron Configurations in Atomic Energy Levels

5. Electron Configurations in Atomic Energy Levels

Electron configuration is the representation of how the electrons in an atom are arranged, which can be used to predict the properties of an element. Learn about patterns of energy levels in elements on the periodic table, how to identify the number of electrons in a neutral atom, and how to write an electron configuration for neutral atoms.

Four Quantum Numbers: Principal, Angular Momentum, Magnetic & Spin

6. Four Quantum Numbers: Principal, Angular Momentum, Magnetic & Spin

Quantum numbers describe specific properties of an electron. Learn about atomic orbital, the four quantum numbers (principal, angular momentum, magnetic, and spin), and how to write quantum numbers based on electron configuration.

The Bohr Model and Atomic Spectra

7. The Bohr Model and Atomic Spectra

The Bohr model of the atom established the existence of a positive nucleus surrounded by electrons in specific energy levels. As electrons move from higher-energy to lower-energy levels, energy in the atom is released in the form of photons. Learn about the Bohr Model, atomic spectra, and how electrons emit different colors of light.

What is a Wave-Mechanical Model?

8. What is a Wave-Mechanical Model?

When scientists realized that electrons around the nucleus of an atom don't really behave like planets around the sun, they had to propose a new model. This lesson will discuss the wave-mechanical model of the structure of an atom.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 220 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.