the nuclei and valence electrons of two different atoms. This attraction results in the two atoms binding together. An ionic bond‚ also called an electron-transfer bond‚ is a type of chemical bond that is a result of the electromagnetic attraction between ions of opposite charges‚ i.e.‚ a cation (a positively charged ion) and an anion (a negatively charged ion). An ion is an atom or group of atoms that has acquired an electrical charge due to the loss or gain of electrons. In an ionic bond‚ an atom
Premium Ion Atom Electric charge
or more elements are chemically combined. b) Chemical bonding involves either transferring or sharing electrons in the highest occupied energy levels (shells) of atoms in order to achieve the electronic structure of a noble gas. c) When atoms form chemical bonds by transferring electrons‚ they form ions. Atoms that lose electrons become positively charged ions. Atoms that gain electrons become negatively charged ions. Ions have the electronic structure of a noble gas (Group 0). d) The elements
Free Atom Electron Chemical bond
Lesson 03.01: History of the Periodic Table Explain how scientific observations led to the development of‚ and changes to‚ the periodic table. Russian chemist Dmitri Mendeleev set out to organize the 63 known elements according to their properties. Mendeleev wrote the name‚ mass‚ and chemical properties of each element on a separate card and arranged the cards by various properties‚ looking for trends and patterns. When he arranged the elements by increasing atomic mass‚ Mendeleev noticed that similar
Free Atom Chemical bond Ion
Basic Electricity Fall 2011 This course module introduces the basic physical models by which we explain the flow of electricity. The Bohr model of an atom – a nucleus surrounded by shells of electrons traveling in discrete orbits – is presented. Electrical current is described as a flow of electrons. Ohm’s law – the relationship between voltage‚ current and electrical resistance – is introduced. Learning Objectives Understanding the basic principles of electricity is a foundational skill for
Premium Atom Electric charge Electron
Biology Notes 1.02 Sometimes a practice or belief claims to be science but does not follow the scientific method or cannot be proven reliable through experimentation. These practices are examples of pseudoscience‚ which literally means "fake science." Charms‚ astrology = stars‚ and phrenology= reading the bump on skull 1.03 * In the mid 1600s in the Netherlands‚ the scientist Antonie van Leeuwenhoek developed the first known microscope using a single magnifying lens. He was the first person
Premium Water Chemical bond Atom
atoms share two pairs of electrons is a ________ bond; it is best described as ________. A) double; covalent B) double; ionic C) single; covalent D) single; ionic E) triple; covalent 3. Which property could describe a covalent compound? A) It conducts electricity when melted. B) Has a low boiling point C) It is composed of a non-metal and a metal. D) It conducts electricity when dissolved in water. E) none of the above 4. In a Lewis dot structure the electrons which complete an octet
Premium Covalent bond Atom Chemical bond
What are key parameters to describe an exciton? An exciton is a bound state of an electron and a hole in an insulator (or semiconductor)‚ or in other words‚ a Coulomb correlated electron/hole pair. It is an elementary excitation of a solid. A vivid picture of exciton formation is as follows: a photon enters a semiconductor‚ exciting an electron from the valence band into the conduction band. The missing electron in the valence band leaves a hole behind‚ of opposite electric charge‚ to which it is
Premium Atom Semiconductor Quantum mechanics
carrying out processing and data storage on the same chip)‚ investigators have been eager to exploit another property of the electron—a characteristic known as spin. Spin is a purely quantum phenomenon roughly akin to the spinning of a child’s top or the directional behavior of a compass needle. The top could spin in the clockwise or counterclockwise direction; electrons have spin of a sort in which their compass needles can point either “up” or “down” in relation to a magnetic field. Spin
Premium Electron Magnetic field Spintronics
photon interactions throughout the radiologic field. These are produced when matter and excited electrons interact with each other at the same level. The photons are able to penetrate through matter without a big interaction due to the energy being absorbed in matter. The photons in this interaction are the x-ray and gamma photons. Their lives are ended when they give off their energy to an electron in need. This interaction along with the other interactions are very important‚ especially for the
Premium Light Electromagnetic radiation Photon
ionic bonding Molecule (nonmetal +nonmetal): covalent bonding 3.1 Metallic Bonding 1) Definition The electrostatic attraction between a lattice if positive ions and delocalized electrons. 2) The strength of metallic bonding (depend on) Delocalized electrons (=valence electrons=Group number) More valence electrons‚ stronger metallic bonding Ionic radii (=distance between nucleus and e-) Greater ionic radius‚ farther distance between nucleus and Ve-‚ stronger the metallic bonding 3) Physical
Premium Chemical bond Electron Covalent bond