How is the table organized? The Periodic Table, first compiled by Russian chemist Dmitri Mendeleyev, is organized by the number of protons in the nucleus of each element's atom, known as the ...

The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and one electron in the region outside the nucleus. The electron and proton are attracted to each other.

Key fact: isotopes are forms of an element that have the same number of protons but different numbers of neutrons. There are three isotopes of hydrogen: hydrogen, deuterium (hydrogen-2 ...

The nucleus of each atom contains protons and neutrons. While the number of protons defines the element (e.g., hydrogen, carbon, etc.) and the sum of the protons and neutrons gives the atomic mass, ...

Key fact Isotopes are forms of an element that have the same number of protons but different numbers of neutrons. There are three isotopes of hydrogen: hydrogen, deuterium (hydrogen-2) and tritium ...

Each element is characterized by its atomic number - how many protons are contained in the atom's nucleus. All hydrogen atoms contain one proton, all oxygen atoms contain eight protons ...

The number of protons is what defines the element ... fluorine-29 from the lighter atoms and collided it with liquid hydrogen, which knocked off the proton necessary to make oxygen-28.

Why do virtually all cells "breathe" by pumping protons (hydrogen ions ... out to 28–38 ATPs per glucose — again, a variable number, and never an integer (Silverstein 2005).

The nuclei of ordinary hydrogen (single protons) zip around with enormous ... the uranium core could be induced to generate a large number of free neutrons. These would make more of the uranium ...