By the periodic table’s logic, all d-block elements should have filled s orbitals. But copper defies that logic. It should have the electron configuration [Ar] 3d 9 4s 2.

Given the enormous popularity of the periodic table in chemistry, doesn't it make sense to build a periodic table for biology? Pawan Kumar Dhar visualises the anatomy, the potential pay-offs and ...

Today, the periodic table is organized by atomic number, which is the number of protons in the nucleus. But they didn’t know about protons then, so they organized everything by atomic weight.

The periodic table didn’t actually start with Mendeleev. Many had tinkered with arranging the elements.

The periodic table stares down from the walls of just about every chemistry lab. The credit for its creation generally goes to Dimitri Mendeleev, a Russian chemist who in 1869 wrote out the known ...

Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications. When you purchase through links on our site, we ...

T he periodic table stares down from the walls of just about every chemistry lab. The credit for its creation generally goes to Dimitri Mendeleev, a Russian chemist who in 1869 wrote out the known ...

Give each student a Periodic Table of Energy Levels activity sheet. This table contains energy level models for the first 20 elements. The electrons are included only for the atoms at the beginning ...

Over 1000 different periodic tables have been proposed since Mendeleev originated the idea 150 years ago. If nature is one, shouldn’t there be ONE periodic table? The 4D Periodic Table of Chemical ...

Most Americans surveyed (59 percent) couldn't name more than 10 elements of the 118 that grace the Periodic Table. This may have been a result of the way the question was asked: Americans probably ...