The video tutorial introduces the basic concepts of chemistry, including elements, molecules, and atoms. It explains the structure of an atom, focusing on protons, neutrons, and electrons, and introduces key terms like mass number and atomic number. The tutorial also covers electronic configuration, using sodium as an example to illustrate how electrons are distributed across energy levels. Finally, it sets the stage for the next lesson on the classification of elements, ions, and types of bonds.

What is the simplest form of a substance that cannot be broken down by chemical means?

• Compound

• Molecule

• Atom

• Element

Which of the following is the smallest building unit of an element?

• Molecule

• Atom

• Electron

• Proton

What does the mass number of an atom represent?

• Number of electrons

• Number of neutrons

• Number of protons

• Sum of protons and neutrons

How many electrons does the sodium element have in its third energy level?

• One

• Two

• Eight

• Eleven

What is the term for the arrangement of electrons in the energy levels of an atom?

• Atomic number

• Mass number

• Electronic configuration

• Molecular structure