Consumer & Gadgets

Samsung's home helper shaped like ball and rolled to CES

Samsung at CES showed its ball-shaped rolling robot that follows you around, beeps and performs tasks as your personal assistant. The company posted a video showing just how Ballie would help out in your home.

Consumer & Gadgets

Robo-crib highlights infant safety at technology show

A robotic crib with a mission of preventing sudden infant death syndrome made its appearance this week at the Consumer Electronics Show, part of a growing "baby tech" exhibit.

Consumer & Gadgets

Bzigo marks mosquitoes for death

Startup Bzigo was at the Consumer Electronics Show this week with a gadget designed to spot mosquitos and then mark them for death.


Chinese firms push ahead at CES despite trade war

Chinese makers of televisions, smartphones and much more were very much present at the premier Consumer Electronics Show here, undeterred by their country's trade war with the US.

Consumer & Gadgets

Kitchens get smarter at CES tech show, not yet in many homes

Tell your refrigerator about your dietary preferences and it'll concoct a recipe plan for the coming week, sending a shopping list to your smartphone when it notices you've run out of the right ingredients.

Consumer & Gadgets

'Sex tech' aims to rise above negative image

Sex toys are for relaxation. For education. For healing after childbirth. For long-term or long-distance relationships. For women's emancipation.

page 1 from 22


The electron is a subatomic particle that carries a negative electric charge. It has no known substructure and is believed to be a point particle. An electron has a mass that is approximately 1836 times less than that of the proton. The intrinsic angular momentum (spin) of the electron is a half integer value of 1/2, which means that it is a fermion. The anti-particle of the electron is called the positron, which is identical to electron except that it carries electrical and other charges of the opposite sign. In collisions electrons and positrons annihilate, producing a pair (or more) of gamma ray photons. Electrons participate in gravitational, electromagnetic and weak interactions.

The concept of an indivisible amount of electric charge was theorized to explain the chemical properties of atoms, beginning in 1838 by British natural philosopher Richard Laming; the name electron was introduced for this charge in 1894 by Irish physicist George Johnstone Stoney. The electron was identified as a particle in 1897 by J. J. Thomson and his team of British physicists. Electrons are identical particles that belong to the first generation of the lepton particle family. Electrons have quantum mechanical properties of both a particle and a wave, so they can collide with other particles and be diffracted like light. Each electron occupies a quantum state that describes its random behavior upon measuring a physical parameter, such as its energy or spin orientation. Because an electron is a type of fermion, no two electrons can occupy the same quantum state; this property is known as the Pauli exclusion principle.

In many physical phenomena, such as electricity, magnetism, and thermal conductivity, electrons play an essential role. An electron generates a magnetic field while moving, and it is deflected by external magnetic fields. When an electron is accelerated, it can absorb or radiate energy in the form of photons. Electrons, together with atomic nuclei made of protons and neutrons, make up atoms. However, electrons contribute less than 0.06% to an atom's total mass. The attractive Coulomb force between an electron and a proton causes electrons to be bound into atoms. The exchange or sharing of the electrons between two or more atoms is the main cause of chemical bonding.

Electrons were created by the Big Bang, and they are lost in stellar nucleosynthesis processes. Electrons are produced by cosmic rays entering the atmosphere and are predicted to be created by Hawking radiation at the event horizon of a black hole. Radioactive isotopes can release an electron from an atomic nucleus as a result of negative beta decay. Laboratory instruments are capable of containing and observing individual electrons, while telescopes can detect electron plasma by its energy emission. Electrons have multiple applications, including welding, cathode ray tubes, electron microscopes, radiation therapy, lasers and particle accelerators.

This text uses material from Wikipedia, licensed under CC BY-SA