Can you name everything from Ac to Zr? Test your knowledge of the periodic table and see if you can top the leaderboard ...

For this element, for actinium, and for polonium, but for none of the others, are the criteria of unique spectrum and chemical character, as found for radium, to be (Continued on page 77) Prof. S ...

Chemical elements make up the staggering variety of molecules that combine to form DNA, cellular organelles, cells, tissues, and organs in the human body.

The modern version of this chemical element chart has been tweaked to account for the quantum theory that governs the arrangement of electrons surrounding the nucleus and the outermost electrons that ...

The explosion of a star, called a supernova, is an immensely violent event. It usually involves a star more than eight times ...

Learn about the periodic table of elements. Find lesson plans and classroom activities, view a periodic table gallery, and shop for periodic table gifts.

Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications.

Astronomers uncover the first direct evidence for how some white dwarf stars explode, confirming the long-debated ...

Build simple atoms and molecule models using plastic construction bricks—like LEGO—as you explore the elements that shaped all life on Earth.

Multiple telescopes observed a rare cosmic explosion called a kilonova that created heavy elements in space, including some necessary for life.

The periodic table of elements is a cornerstone of modern chemistry, representing the organized arrangement of all known chemical elements. Its iconic layout provides scientists with a systematic ...

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...