Browse Definitions :
Definition

proton

A proton is a subatomic particle found in the nucleus of every atom.  The particle has a positive electrical charge, equal and opposite to that of the electron. If isolated, a single proton would have a mass of only 1.673 ? 10-27 kilogram, just slightly less than the mass of a neutron.

The number of protons in an element's nucleus is called the atomic number.  This number gives each element its unique identity.  In the atoms of any particular element, the number of protons in the nuclei is always the same.  An atom of simple hydrogen has a nucleus consisting of a single proton all by itself.  The nuclei of all other elements nearly always contain neutrons in addition to protons.

Protons need not be confined to the nuclei of atoms.  When protons are found outside atomic nuclei, they acquire fascinating, bizarre, and potentially dangerous properties, similar to those of neutrons in similar circumstances.  But protons have an additional property. Because they carry an electric charge, they can be accelerated by electric and/or magnetic fields.  High-speed protons, and atomic nuclei containing them, are emitted in large numbers during solar flares.  The particles are accelerated by the earth's magnetic field, causing ionospheric disturbances known as geomagnetic storms.

This was last updated in May 2008

SearchCompliance

SearchSecurity

  • cyber attack

    A cyber attack is any attempt to gain unauthorized access to a computer, computing system or computer network with the intent to ...

  • backdoor (computing)

    A backdoor is a means to access a computer system or encrypted data that bypasses the system's customary security mechanisms.

  • post-quantum cryptography

    Post-quantum cryptography, also called quantum encryption, is the development of cryptographic systems for classical computers ...

SearchHealthIT

SearchDisasterRecovery

  • risk mitigation

    Risk mitigation is a strategy to prepare for and lessen the effects of threats faced by a business.

  • call tree

    A call tree is a layered hierarchical communication model that is used to notify specific individuals of an event and coordinate ...

  • Disaster Recovery as a Service (DRaaS)

    Disaster recovery as a service (DRaaS) is the replication and hosting of physical or virtual servers by a third party to provide ...

SearchStorage

  • cloud SLA (cloud service-level agreement)

    A cloud SLA (cloud service-level agreement) is an agreement between a cloud service provider and a customer that ensures a ...

  • NOR flash memory

    NOR flash memory is one of two types of non-volatile storage technologies.

  • RAM (Random Access Memory)

    RAM (Random Access Memory) is the hardware in a computing device where the operating system (OS), application programs and data ...

Close