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Made up of helium nuclei traveling at 5-7% speed of light:


A) alpha particles
B) gamma rays
C) beta particles
D) neutrons

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Complete the following table. Complete the following table.

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line 1: alpha, +2
li...

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After four half-lives the activity of a radioactive sample has decreased to one quarter of the initial value.

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A neutron has no charge and negligible mass.

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When Phosphorous-30 loses a positron what is the product of this radioactive decay?


A) When Phosphorous-30 loses a positron what is the product of this radioactive decay? A) B) C) D)
B) When Phosphorous-30 loses a positron what is the product of this radioactive decay? A) B) C) D)
C) When Phosphorous-30 loses a positron what is the product of this radioactive decay? A) B) C) D)
D) When Phosphorous-30 loses a positron what is the product of this radioactive decay? A) B) C) D)

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The units of activity are known as the curie (Ci)and the becquerel (Bq). Write down the relationship between them.

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A fossil found in a cave was found to have a Carbon-14 ratio to carbon of 1/ 32 of a live object. If the half life of Carbon-14 is 5730 yrs, how old is the object?


A) 5730 yrs
B) 28,650 yrs
C) 34,480 yrs
D) 17,190 yrs

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The half life of a specific radionuclide is 8 days. How much of an 80 mg sample will be left after 24 days?


A) 40 mg
B) 20 mg
C) 10 mg
D) 2) 7 mg

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After three half-lives 25 radioactive nuclei remain from an initial 200.

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Adding one proton to the nucleus of an atom:


A) increases the atom ic number and the mass number by one unit
B) increases its atomic mass by one unit, but does not change its atomic number
C) increases its atomic number by one unit but does not change its atomic mass
D) does not change either its atomic number or its atomic mass

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An atom of Pb-208 contains 126 neutrons.

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The quantity (mass number - atomic number) provides:


A) the number of neutrons in a nucleus
B) the number of electrons in the atom
C) the number of protons in a nucleus
D) the combined number of all the neutrons and all the protons in a nucleus

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Which particle(s) are in the nucleus?


A) Protons only
B) Neutrons only
C) Protons and neutrons
D) Protons and electrons

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The neutral atom contains equal numbers of protons and electrons.

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In order to have 1/16 of a radioactive sample left how many half lives must the sample go through to reach this amount?


A) 3
B) 4
C) 5
D) 6

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Complete the following equations with the symbol for the atom or particle represented by the blank space. Show the mass numbers and atomic numbers of the isotopes formed or the symbols of the subatomic particles: A) Complete the following equations with the symbol for the atom or particle represented by the blank space. Show the mass numbers and atomic numbers of the isotopes formed or the symbols of the subatomic particles: A) B) C) D) E) F) G) B) Complete the following equations with the symbol for the atom or particle represented by the blank space. Show the mass numbers and atomic numbers of the isotopes formed or the symbols of the subatomic particles: A) B) C) D) E) F) G) C) Complete the following equations with the symbol for the atom or particle represented by the blank space. Show the mass numbers and atomic numbers of the isotopes formed or the symbols of the subatomic particles: A) B) C) D) E) F) G) D) Complete the following equations with the symbol for the atom or particle represented by the blank space. Show the mass numbers and atomic numbers of the isotopes formed or the symbols of the subatomic particles: A) B) C) D) E) F) G) E) Complete the following equations with the symbol for the atom or particle represented by the blank space. Show the mass numbers and atomic numbers of the isotopes formed or the symbols of the subatomic particles: A) B) C) D) E) F) G) F) Complete the following equations with the symbol for the atom or particle represented by the blank space. Show the mass numbers and atomic numbers of the isotopes formed or the symbols of the subatomic particles: A) B) C) D) E) F) G) G) Complete the following equations with the symbol for the atom or particle represented by the blank space. Show the mass numbers and atomic numbers of the isotopes formed or the symbols of the subatomic particles: A) B) C) D) E) F) G)

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A) blured image B) blured image C)...

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