Some substances, like particles of this iron, contain only one kind of atom. Iron is an element. It is made of only one type of atom: iron atoms. Sulfur is another element. It contains only sulfur ...

Ernest Rutherford had only recently shown that striking the atom of one element could make it emit electrons and turn into a different element. Lawrence joined the physics faculty of the ...

Thus when an atom absorbs or gives off energy (as in light ... was the key to the periodic repetition of properties of the elements. The shells in which electrons orbit have different quantum ...

Electronegativity, an essential characteristic of all elements in the periodic table, measures an atom's ability to attract electrons towards itself within a chemical bond. This vital theoretical ...

Currently, little is known about where and when trace elements are incorporated into pyrite. A recent study using atom probe tomography (APT), however, successfully characterized trace element ...