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Name_______________________________ period____Isotopes and relative weight review worksheet 1. Complete the following table. Element Symbol # of protons # of electrons Molybdenum mass number # of neutrons 96 Kr 48 14 28 Hg+ 121 2. Complete the following tables. Subatomic Particle Charge(+,-, neutral) Location in the atom Proton Neutron Electron 3. Put the people (or atomic theory) listed below in the correct chronological order and describe how our 'picture' of the atom changed with each. A. Dalton B. Rutherford C. Bohr D. Modern E. Thomson 8.Match the following historic scientist with the experiment, discovery or contribution to our understanding of atomic structure. Use the following choices: Dalton (D), J.J. Thompson (T), Ernest Rutherford (R), Neils Bohr (B), Modern Quantum View (MQV). _____a. Developed the plum-pudding model of the atom. _____b. First person to develop a nuclear model of the atom. _____c. First person credited with providing emperical evidence for the existence of atoms. _____d. Proposes that the precise location and energy of an electron can not be simultaneously known. _____e. Bombarded gold foil with alpha particles and observed scattering. _____f. Proposed the existence of orbitals - regions of space having a high probability of an electron being located in it. _____g. Suggested that electrons orbit the nucleus in fixed paths with quantized energy levels. _____h. Experimented with cathode rays and discovered the existence of the electron. Elements and Their Isotopes Part of Atom proton neutron electron Charge +1 0 -1 Atomic weight (u) 1.0073 1.0087 0.000549 Because electrons weigh so little we do not count them when figuring out the weight of an atom or an isotope. Only the proton and neutron are used. 1. The common form of helium gas (the gas often put in balloons) is called helium-4. a. The number of protons in any atom is the same as its atomic number. What is the atomic number of helium? _____ b. How many protons does helium have? _____ c. Helium has two neutrons, plus the number of protons you determined. Find the total atomic weight of helium-4. d. Why do you think helium-4 is called helium-4? 2. The common form of iodine (the liquid that is often put on cuts and wounds) is called iodine-126. a. The number of protons in any atom is the same as its atomic number. What is the atomic number of iodine? _____ Therefore iodine has ____ protons. c. Iodine has 73 neutrons, plus the number of protons you determined. Find the total atomic weight of iodine-126. Show your calculations. d. Why do you think iodine-126 is called iodine-126? 3. The common form of uranium (a metal used in nuclear reactors) is called uranium-238. a. The number of protons in any atom is the same as its atomic number. The atomic number of uranium is _____. Therefore uranium has _____ protons. b. Uranium has 146 neutrons, plus the number of protons you determined. Find the total atomic weight of uranium-238. Show your calculations.