earth science

When Uranium 238 decays, it emits 8 alpha particles and 6 beta particles before finally becoming the stable daughter product; What is the atomic number and mass number of the daughter product? Show your work.

  1. 👍 0
  2. 👎 0
  3. 👁 236
  1. each α-particle is composed of two protons and two neutrons
    ... a helium nucleus

    a beta particle is an electron from the decay of a neutron
    ... this results in a proton and the beta electron

    32 nucleons are emitted ... 16 protons and 16 neutrons

    6 of the remaining neutrons decay into protons

    1. 👍 1
    2. 👎 0
  2. 92U238 ==> 2He4 + 90X234
    90X234 ==> 2He4 + 88Y230
    88Y230 ==> 2He4 + 86Z226
    etc. Subtract 2 for atomic number and 4 for mass number.
    For beta particle, you increase atomic number by 1 and leave mass number the same. Follow the series down the chain until you get to the end with 8 alpha and 6 beta emissions.
    OR you can do it this way.
    For alpha. 8 x -2 protons = -16 protons
    ................8 x -2 neutrons = -16 neutrons or -32 for mass number.
    For beta. 6 x +1 proton = 6 protons.
    So 92U238
    238-32 = 206 for mass number.
    92 -16 + 6 = 82 for the atomic number and you're left with 82X206. What's X? Look on the periodic chart and find atomic number of 82 is Pb so the chain ends at 82Pb206

    1. 👍 1
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    Rutherford fired a beam of alpha particles (helium nuclei) at a thin sheet of gold. An alpha particle was observed to be deflected by 90.0°; its speed was unchanged. The alpha particles used in the experiment had an initial speed

  2. Physics 1

    The drawing shows three particles far away from any other objects and located on a straight line. Particle B is located in the middle of particles A and C. The distance between particles A and B is 0.500 m. The distance between

  3. Chemistry

    Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to

  4. Science

    Which of the following statements best describes the particles of liquid? a.The particles are far apart and moving fast. b.The particles are close together but moving past each other. c.The particles are far apart and moving

  1. Physics

    In a location in outer space far from all other objects, a nucleus whose mass is 3.57232e-25 kg and which is initially at rest undergoes spontaneous "alpha" decay. The original nucleus disappears, and two new particles appear: a

  2. Chemistry

    Uranium-235 can be separated from U-238 by fluorinating the uranium to form UF6 (which is a gas) and then taking advantage of the different rates of effusion and diffusion for compounds containing the two isotopes. Calculate the

  3. phisycal sciences

    Which of the following properties did Rutherford use in his experiment? A. the negative charge of the alpha particles and the random distribution of protons B. the negative charge of the alpha particles and the positive charge of

  4. Science

    13.)How can substance A and B be compared? Choose all that apply. A.)The particles of substance A have more energy than the particles of substance B.*** B.)The particles of substance A are more tightly held together than the

  1. chemistry

    Technetium-99m emits only gamma radiation. Why would this type of radiation be used in diagnostic imaging rather than an isotope that also emits beta or alpha radiation?

  2. maths

    if alpha and beta are the zeros of the polynomial 2x^2-4x+5 then find the values of (i)alpha^2+beta^2 (ii)1/alpha^2+1/beta^2 (iii)(r)alpha/beta+(r)beta/alpha (iv)alpha^-1+beta^-1

  3. Physics

    Why are alpha and beta rays deflected in opposite directions in a magnetic field? Why are gamma rays not deflected at all? Why are alpha particles with the same velocity deflected less than beta particles?

  4. Chemistry

    Write the symbols and a balanced nuclear equation for the following: a. Polonium -210 decays to give lead -206 b. Bismuth -211 decays by emitting an alpha particle c. The product from b. emits a beta particle d. When an alpha

You can view more similar questions or ask a new question.