Chemistry

Learn about chemistry, the study of matter and its reactions. Find projects, study notes, periodic tables, and worked example problems.

Strong and Weak Acids — Strong and weak acids are key concepts in chemistry. Strong acids completely dissociate into their ions in water, while weak acids incompletely dissociate. There are only a few strong acids, but many weak acids. Strong Acids Strong acids completely dissociate in water into their ions and produce one of more […]

List of Common Strong and Weak Acids Recently updated !

This entry was posted on February 28, 2020 by Anne Helmenstine (updated on February 28, 2020)

Here are the names, element symbols, and atomic numbers of the first 20 elements of the periodic table. — It’s handy to know the first 20 elements of the periodic table. Around 99% of the mass of the human body is made of six of these elements. The first 20 elements are also a good overview of the different element groups. The elements are listed in order of increasing […]

First 20 Elements of the Periodic Table Recently updated !

This entry was posted on February 26, 2020 by Anne Helmenstine (updated on February 26, 2020)

Protons and neutrons aren’t electrically attracted to each other, so have you ever wondered why they stick together in the atomic nucleus? The strong interaction produces the strong nuclear force, which holds matter together when the particles are close enough. The Strong Force The strong force is one of the […]

Why Protons and Neutrons Stick Together in the Atomic Nucleus Recently updated !

This entry was posted on February 19, 2020 by Anne Helmenstine (updated on February 19, 2020)

Atoms are often considered to be the building blocks of matter because they are the smallest units of chemical elements. These 10 atom facts cover basic information about atoms and some fun facts as well. The word atom comes from the Greek word atomos, which means “undivided” or “uncut.” The […]

10 Interesting Atom Facts Recently updated !

This entry was posted on February 19, 2020 by Anne Helmenstine (updated on February 19, 2020)

Colorful Periodic Table With 118 Elements Wallpaper — This colorful periodic table wallpaper is a bright and cheerful way to decorate your desktop and have access to basic elemental information. This includes all 118 element's atomic number, element symbol, element name, and atomic mass.

Colorful Periodic Table Wallpaper with 118 Elements

This entry was posted on November 18, 2019 by Todd Helmenstine (updated on November 18, 2019)

Periodic Table Blueprint — Have you ever needed to build your own periodic table? This blueprint periodic table is the design you need!

Blueprint Periodic Table Wallpaper

This entry was posted on November 6, 2019 by Todd Helmenstine (updated on November 6, 2019)