# Physics

 What part of the atom is not part of the nucleus? Element Name for the smallest amount of an element we can have atom The atomic number tells us what about the atom? Number of neutrons Valence electrons represent the number of electrons In the outermost shell The atomic mass tells us what about the atom? Number of protons and neutron Element with 24 proton Chromium Two atoms of the same element that differ in their number of neutrons are Isotopes If mercury-201 is given two more neutrons it would become 203 Hg 80 Generic formula for a radioactive element: Atomic number Symbol for the element Atomic weight (relative mass) When an atom that wants to gain an electron comes in contact with an atom that wants to lose an electron, what is likely to happen? An ionic bond Ionic bond One atom gives away an electron and the other takes it Covalent bond Two atoms stick together and share electrons Hydrogen 1H1.0079 Helium 2He4.0026 Lithium 3Li6.942 Berylilum 4Be9.0122 Boron 5B10.811 Carbon 6C12.011 Nitrogen 7N14.007 Oxygen 8O15.999 Fluorine 9F18.998 Neon 10Neon20.180 Sodium 11Na22.990 Magnesium 12Mg24.305 Aluminium 13Al26.086 Phosphorus 14P30.974 Sulfur 16S32.0974 Chlorine 17Cl35.453 Argon 18Ar39.948 Potassium 19K39.098 Calcium 20Ca40.078 Scandium 21Sc44.956 Titanium 22Ti47.867 Vanadium 23V50.942 Chromium 24Cr51.996 Manganese 25Mn54.938 Iron 26Fe55.845 Cobalt 27Co58.933 Nickel 28Ni58.693 Copper 29Cu63.546 Zinc 30Zn65.38 How many electrons can fit in the lowest energy level of an atom? 2 The atomic number is equal to The number of protons The number of neutrons is equal to The atomic mass minus the atomic number How do you find the average atomic mass for an atom? Take the abundance in nature percentage and multiply it by the atomic mass number. add those numbers together. Ex. 90.5% neon-20, 0.3% neon-21, 9.2 neon-22..905*20=18.1 .003*21=.063.092*22=2.024(The sum is)=20.187 AMU What is the difference between oxygen-16 and oxygen-18? They are isotopes, oxygen-16 has 16neutrons and oxygen-18 has 18 neutrons Protons and neutrons have a mass of 1 Electrons have a mass of 1/1800 (counted as 0) In an electrically neutral atom the number of protons in the nucleus is equal to the number of electrons in that surround the nucleus A positive electron has more protons than electrons The unti of electric charge, the coulomb, is the charge on a specific large number of electrons The electrical force between charges is strongest when the charges are Close together Combing your hair rubs electrons from your hair onto a comb. The comb becomes Negatively charged Electric potential, measured in volts, is the ratio of electric energy to the amount of electric Charge If you comb your hair and the comb becomes positively charged, then your hair becomes Negatively charged Insulator Something that holds onto its electrons Conductor Holds loosely to its electrons Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore the particles must have Opposite sides Charge flows in A closed circuit The primary cause of voltage is not Voltage The primary source of electrons in an ordinary electrical circuit is The electrical circuit itself When a light is turned on in a DC circuit, the average speed of electrons in the lamp is Less than 1 cm/s An ampere is a unit of electrical Current If you want to find the value of the electric field at the place where the charge is located you use electric field strength= F/q A positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread. After being charged once, the plates are disconnected from the battery. Describe the behavior of the ball The + bll would attract to the - plate. Once it made contact it would become - charged and attract to the + plate, and so on until either plate is no longer charged. What is the difference between voltage and electrical potential energy Electrical potential energy is the potential energy of a specific charge based on its position in the system. The voltage or eletrical potential is the difference in electrical potential across a wire or circuit element. What does a circuit breaker do? It limits the amount of current that can flow through a circuit. What is the difference between a 20amp and a 15amp circuit breaker? The 20amp will allow 20amps, the 15amp will allow 15 amps The current Remains constant Which way do electrons flow? From negaive to positive. AuthorECCammi ID157890 Card SetPhysics DescriptionNotes for the Final Updated2012-06-09T02:36:35Z Show Answers