Editing Subatomic particle (section)

== Dividing an atom ==
The negatively charged electron has a mass of about {{sfrac|1836}} of that of a [[hydrogen]] atom. The remainder of the hydrogen atom's mass comes from the positively charged [[proton]]. The [[atomic number]] of an element is the number of protons in its nucleus. Neutrons are neutral particles having a mass slightly greater than that of the proton. Different [[isotope]]s of the same element contain the same number of protons but different numbers of neutrons. The [[mass number]] of an isotope is the total number of [[nucleon]]s (neutrons and protons collectively).

[[Chemistry]] concerns itself with how electron sharing binds atoms into structures such as crystals and [[molecule]]s. The subatomic particles considered important in the understanding of chemistry are the [[electron]], the [[proton]], and the [[neutron]]. [[Nuclear physics]] deals with how protons and neutrons arrange themselves in nuclei. The study of subatomic particles, atoms and molecules, and their structure and interactions, requires [[quantum mechanics]]. Analyzing processes that change the numbers and types of particles requires [[quantum field theory]]. The study of subatomic particles ''per se'' is called [[particle physics]]. The term ''[[high-energy physics]]'' is nearly synonymous to "particle physics" since creation of particles requires high energies: it occurs only as a result of [[cosmic ray]]s, or in [[particle accelerator]]s. [[phenomenology (particle physics)|Particle phenomenology]] systematizes the knowledge about subatomic particles obtained from these experiments.<ref>{{cite book |last=Taiebyzadeh |first=Payam |title=String Theory: A Unified Theory and Inner Dimension Of Elementary Particles (Baz Dahm) |publisher=Shamloo Publications |year=2017 |isbn=978-6-00-116684-6 |location=Iran}}</ref>