All isotopes of a given element have the same atomic number, neutron number, mas

Question

All isotopes of a given element have the same atomic number, neutron number, mass number, atomic number and neutron number, atomic number and mass number, neutron number and mass number, or atomic number, neutron number, and mass number. Stable isotopes of the heavier atoms have more protons than neutrons or more neutrons than protons in their nuclei. A deuteron is a particle composed of a proton and a neutron bound together. Which of the following is greater? mass of deuteron mass of proton plus mass of neutron equal A radioactive sample of emits 256 beta particles per second. After how many half-lives will this sample emit 1 beta particle per second? 1 2 3 4 5 6 7 8 9 10 Consider the alpha decay: Which is greater? mass of mass of He plus mass of

Explanation / Answer

1 (d)   Ref: http://simple.wikipedia.org/wiki/Isotope

2 (b)   Ref: http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/nucnot.html

3 (c)

4 (h)

N = No e-kt

or 256 = 1 * e-kt

or e-0.693/t1/2*t = 256

or ln 256 = -(0.693/t1/2) * t

or 5.545 = -(0.693/t1/2) * t

or t /t1/2 = 8

5 (a)

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