Introduction to Elements, Atoms and the Periodic Table - Revised

With this free online chemistry course, you can discover more about atoms, elements and the periodic table, today.

Free Course
This free online chemistry course will teach you all the basics of elements, atoms, and the periodic table. You will learn about the structure of the atom and the role of the subatomic particles neutrons, protons and electrons, along with the atomic structure of the known elements. By the end of the course, you will have received a solid introduction to basic chemistry, you will be much more ready for more advanced chemistry lessons.
  • Duration

    2-3 Hours
  • Assessment

  • Certification

  • Responsive

  • Publisher

    Khan Academy





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Two fundamental aspects of chemistry are, firstly, the structure of the atom and the role of the subatomic particles neutrons, protons and electrons, and, secondly, the atomic structure of the known elements that make up everything. These elements’ place in the Periodic table of the elements determines their chemical properties. This free online course will give learners a comprehensive knowledge and understanding of these two core building blocks within chemistry. 

The course starts by examining the structure of the atom and subatomic particles, and then discusses the elements, and breaks them down into their subatomic structure of protons, neutrons and electrons. You will learn how the structure of each element determines its place in the Periodic table and its chemical properties. 

This course will be of great interest to all students who wish to pursue a career in any of the sciences such as chemistry, physics, biology or geology, or the individual learner who simply wants to learn and understand what the world around us is made up of.

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Learning Outcomes

After completing this course you will be able to:

• Describe the structure of an atom
• Identify different periods and groups in the Periodic Table
• Outline how to work out the electronic configuration of an element
• Define the term ionization
• Identify how and why atoms bond


All Alison courses are free to enrol, study and complete. To successfully complete this Certificate course and become an Alison Graduate, you need to achieve 80% or higher in each course assessment. Once you have completed this Certificate course, you have the option to acquire official Certification, which is a great way to share your achievement with the world. Your Alison Certification is:

Ideal for sharing with potential employers - include it in your CV, professional social media profiles and job applications
An indication of your commitment to continuously learn, upskill and achieve high results
An incentive for you to continue empowering yourself through lifelong learning

Alison offers 3 types of Certification for completed Certificate courses:

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