A handwritten draft of Mendeleev’s periodic table, in which he organized the elements by atomic weight to reveal the periodic law, showing how ... of 69.9 and a density six times that of water.

Everyone walking out of high school knows what atoms and the periodic table are. They know what the sub-atomic particles and their associated electric charges are. In this article, we’re going ...

At the far end of the periodic table ... a greater density of electrons closer to the nucleus, Schwerdtfeger says. These changes are known as relativistic effects. These effects show up even ...

Scientists are showing renewed interest in studying space ... The asteroid appears to be denser than any known elements on the periodic table, potentially indicating the presence of an element ...

The first 117 elements on the periodic table were relatively normal ... the high speeds of electrons in superheavy elements, show how strange the element may be. Instead of residing in discrete ...