Atomic Structure And Electrons - Structure Of An Atom - What Are Atoms - Neutrons Protons Electrons

The video introduces atomic structure in a basic way, explaining that atoms are the fundamental units of chemical elements and contain subatomic particles within a nucleus and an electron cloud.

It details subatomic particles: protons and neutrons in the nucleus, and electrons in the surrounding cloud. Protons carry a positive charge, neutrons are uncharged, and electrons have a negative charge. Atoms are electrically neutral because they have an equal number of protons and electrons.

Using carbon as an example, the video illustrates electrons in shells or energy levels around the nucleus. Each shell has a maximum electron capacity, and only electrons in the outermost shell participate in chemical reactions.

Atoms with one shell require 2 electrons for stability, as seen with stable helium. Hydrogen, with only one electron in its sole shell, is reactive. For atoms with more than one shell, 8 electrons in the outermost shell are needed for stability. Neon, with 8 outer electrons, is stable, while oxygen, with 6, is reactive.

Atoms with fewer than 8 electrons in their outermost shell will share, gain, or lose electrons to achieve stability, a principle known as the octet rule. Exceptions include hydrogen and helium, which only have one energy level.