• Atom Book Protons Neutrons Helium
    282 words
    Atom Book Hey kids! Today I'm going to introduce you to the world of atoms. Atoms are little things that you or anybody else have ever seen. Make up things like trees, cars, paper, even you. So let's shrink down to size and see what it's like. We " re going to into the Helium atom today. An atom is made of little things called protons, , and electrons. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. Electrons travel around the center of the atom, w...
  • Resistance Basic Guide Energy Transferred
    1,392 words
    A basic guide to resistance. Electron Flow Model Everything is made of very small particles called atoms. Each atom has a heavy positively charged nucleus and is surrounded by a cloud of light, negatively charged, electrons. In metals, the outer most electron of each atom is weakly attracted to the positive nucleus and can escape from the atom and wander around between the atoms. [Note 1] So, in metals, we have all these millions and millions of electrons whizzing about at high speed, in random ...
  • Electron Microscope Specimen Image Beam
    272 words
    The electron microscope, instrument that produced the first magnified image showing 'three-dimensional' and highly magnified image of a small object. It directs a beam of electrons rather than light through a specimen. The beam of electrons is created from an electron gun. This beam then travels through the length of the microscope cylinder, which contains the lenses, the specimen chamber, and the image-recording system. Two types of electron lenses are used, electrostatic and electromagnetic. T...
  • Periodic Table Family Element Electrons
    323 words
    1. periodic law-law that states the physical & chemical properties of the elements are periodic functions of their atomic numbers 2. group-column of elements in the periodic table; family 3. family-column of elements in the periodic table; group 4. period-horizontal row of elements in the periodic table 5. metal-element that is a good conductor of heat & electricity, is shiny, has a high melting point, tends to lose electrons 6. luster-shininess 7. ductile-able to be drawn into a thin wire 8. m...
  • Excited State Atoms Energy Laser
    268 words
    The Laser/Atom Connection A laser is a device that controls the way that energized atoms release photons. Laser is an acronym for Light Amplification by Stimulated Emission of Radiation, which describes very succinctly how a laser works! Although there are many types of lasers, all have certain essential features. In a laser, the lasing medium is "pumped" to get the atoms into an excited state. Typically, very intense flashes of light or electrical discharges pump the lasing medium and create a ...
  • Resistance Of Wire Length Electrons Doubles
    301 words
    A imI am going to be studying the resistance of wire. The purpose of this investigation is to see how the length of wire affect the dependent variable, resistance. Prediction I predict that, as the length of the wire doubles, the resistance will also double, This means that the length will affect the resistance. Hypothesis Resistance is caused by electrons bumping into ions. If the length of the wire is doubled, the electrons bump into twice as many ions so there will be twice as much resistanc...
  • Solar Cells Crystalline Silicon
    1,206 words
    Solar cells Solar cells today are mostly made of silicon, one of the most common elements on Earth. The crystalline silicon solar cell was one of the first types to be developed and it is still the most common type in use today. They do not pollute the atmosphere and they leave behind no harmful waste products. Photovoltaic cells work effectively even in cloudy weather and unlike solar heaters, are more efficient at low temperatures. They do their job silently and there are no moving parts to w...
  • Bonding And Elements Boiling Points
    465 words
    Element a substance which cannot be broken down into two or more substances by any means. Only contains one type of atom. Compound a substance in which atoms of two or more elements have been chemically combined. Ionic Bonding. Metals bonding with non-metals. Involves transfer of electrons from metal to non-metal, so that both species obtain full outer shell electron configurations (Noble gas configuration)... Metals lose electrons to form positive ions (Cations)... Non-metals gain electrons to...
  • Electrical Pressure Resistance Current Wire
    597 words
    Electricity has three features that include current, voltage and resistance. Current is the flow of electrons round a circuit that is measured by the ammeter in amps (A). Whilst the voltage, refer to as potential difference, is the driving force that circulates the current around the circuit that acts like an electrical pressure. The unit of measurement for this is Volts (V), which is measured by a voltmeter. Resistance is a force that slows down the current; consequently it slows down the flow...
  • Bohr At The Rutherford Lab
    382 words
    Bohr at the Rutherford Lab Everyone at the time imagined the atom as a "plum pudding." That is, it was roughly the same thing throughout, with negatively charged electrons scattered about in it like raisins in a pudding. As part of an experiment with x-rays in 1909, Rutherford was shooting a beam of alpha particles at a sheet of gold foil only 1/3000 of an inch thick, and tracing the particles' paths. Most of the particles went right through the foil, which would be expected if the atoms in the ...
  • Physics Plan Resistance Of A Wire
    709 words
    Physics Plan - Resistance of a Wire Aim The aim of my investigation is to investigate how length affects the resistance of a wire. Theory The four factors that affect the resistance of a wire are: o Length o Material o Temperature o Cross section Resistance is the force, which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. Resistance is measured in ohms. Resistance occurs when the electrons travelling along th...
  • Light Bulb Electric Electrons Charges
    746 words
    Electricity Monica Smith Summary of Demonstration: This experiment will show us how energy current moves through circuits. I will be pointing out the different parts and telling what they do, and how they contribute so that the energy flows through them all. Finally, I will close the cardboard piece so that everyone will be able to actually see the result of the electric current. Scientific Explanation: To explain my demonstration and how it works, we will have to start all the way back at elect...
  • Identify That Metals Have Crystal Lattice Structure
    296 words
    web >. The atoms in a crystal are in a regular repeating pattern called the crystal lattice... A crystal lattice is defined by a repeated three-dimensional unit... The basic building block of these crystalline structures is known as the "unit cell" and this "unit cell" repeats itself over and over to form a lattice... When a pure metal starts to form from a cooling molten state, the atoms arrange themselves in an ordered geometrical pattern that is repeated over and over again producing a crysta...
  • Investigation Into The Resistance Of Wires
    722 words
    Aim: I am trying to find out what affect changing the length of a piece of nichrome wire has on the current flowing through it. What happens if you change the thickness as well? Diagram: I will need the following equipment: 1 x Ammeter 1 x Voltmeter 1 x Power supply 1 x Variable resistor 1 x Length of nichrome wire 1 x Meter-rule 6 x Connecting wires 1 x Crocodile clip My prediction is: If the length of the wire is increased, then the resistance will increase. This is due to the electrons having...
  • Physics Resistance Of Wires
    654 words
    Detailed method: - I set up the circuit as shown in the diagram that I have drawn. I started the experiment by taping a meter ruler between the terminal blocks P, Q so that I could measure 100 cm of nichrome wire. I made sure that the wire was carefully tightened at both terminals to try to minimise the kinks or twists in the wire. I then switched on the power pack supply and adjusted the variable resistor until a constant current of 0. 2 A was flowing through the circuit. I then recorded the co...
  • Conduction Band Electrons Energy Valence
    2,605 words
    What is a semiconductor and what is the basis of this classification? A semiconductor is a material that intermediates between a conductor and an insulator. Electrical conduction represents the ability of a material to conduct electric charges. Some materials are very good at it and are called conductors; the materials that are hopeless at it are called insulators. Semiconductors (aka semi-insulators) are not very good at it. But under certain conditions, they can almost be a conduct...
  • Structure And Bonding Covalent Bond
    2,793 words
    In my essay on the structure and bonding in different substances, I am going to focus on electronic arrangement and their effects on the properties of the substance. METALIC BONDING Metallic bonding occurs between atoms with low electronegativity (. i. e. 1, 2 or 3 valence electrons); therefore there are many vacancies in valence shell. The crystal lattice of metals consists of ions NOT atoms. When electron clouds overlap, electrons can move into electron cloud of adjoining atoms. The outer ele...
  • Electrons Protons Neutrons Number
    388 words
    33. Elements differ according to the number of protons their atoms contain, a value called the element's atomic number. All atoms of a given element have the same number of protons and an equal number of electrons. The number of neutrons in an atom is not predictable but is generally as great or greater than the number of protons. The total number of protons plus neutrons in an atom is called the atom's mass number. 40. Protons, electrons, and neutrons. Protons, neutrons (1 amu) and electro...
  • A Brief History Of Atomic Theory
    713 words
    In the beginning of the 1800 s John Dalton, an English scientist did work some work on gases, which lead him to the creation of a complex system of symbols for all known elements at the time. He took all the information he had collected, along with the Laws of Conservation of Mass, Definite Composition and Multiple Proportions and updated Aristotle? s theory of matter with the Atomic Theory of Matter, which stated: – All matter is composed of tiny, indivisible particles called atoms. ̵...
  • Niels Bohr October 21
    183 words
    October 21, 1998 Niels Bohr Niels Bohr was born in Copenhagen, he is the son of a physiology professor, and went to school at the University of Copenhagen, this is where he got his doctorate in 1911. Bohr won the Nobel piece prize for his theory of atomic structures. According to Microsoft Encarta His work drew on Rutherford? s nuclear model of the atom, in which the atom is seen as a compact nucleus surrounded by a swarm of much lighter electrons. He thought that electrons are arranged in defin...