It is the number of protons, otherwise known as the atomic number, that determines which element any given atom represents. If an atom has 2 protons, that’s an atom of the element helium.

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 ...

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 ...

SINCE Moseley's discovery of the fundamental laws of the X-ray emission, it has become quite clear that the most simple and conclusive characteristic of a Chemical element is given by its X-ray ...

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 ...