Honors Chem TGT: Unit 3
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Who was responsible for developing the atomic theory of matter?
Who was responsible for the first idea of the atom?
Define “atom” in present-day terms.
Complete this idea from the atomic theory ”Each element is composed of…”
Complete this idea from the atomic theory ”All atoms of a given element are identical, but…”
Complete this idea from the atomic theory ”Atoms are neither created nor…”
Complete this idea from the atomic theory ”A given compound always has the same…”
What was the model for the atom called the “plum-pudding” model?
Who performed the gold-foil experiment?
What were the two major discoveries to come from the gold-foil experiment?
What is the name given to the central core of the atom?
What particle(s) make up the nucleus?
Describe the density of the nucleus.
Describe the density of the energy levels.
What particle(s) is(are) located in the energy levels?
What is the mass of a proton in amu’s?
What is the mass of the neutron in amu’s?
What is the mass of the electron in amu’s?
What is the relative charge of the electron?
What is the relative charge of the proton?
What is the relative charge of the neutron?
The atomic number of an element gives the number of _____.
The mass number of an isotope gives the number of _____.
Why are most masses on the periodic table decimal numbers?
How many protons are in a neutral atom of manganese?
How many neutrons are in zinc-66?
How many electrons are in a neutral atom of phosphorus?
What isotope is the basis for the atomic mass unit?
Three isotopes of masses 36, 37, and 38 amu exist in %’s of 90, 5, and 5 respectively. What
mass would you expect the average atomic mass to proximate?
Which subatomic particle is responsible for the identity of the atom?
Define “isotope”.
What is the charge of an alpha particle?
What is the charge of a positron?
What is the mass of an alpha particle?
What is the charge of a beta particle?
What is the mass of a beta particle?
Which type of nuclear radiation travels the fastest?
Which type of nuclear radiation is the heaviest?
Which type of nuclear radiation can be stopped by paper or clothing?
Which type of nuclear radiation cannot penetrate thin sheets of metal?
What is the nuclear symbol for Ag-108?
How many protons, neutrons, and electrons are in Pt-196?
Write an equation for the alpha decay of Ra-226.
Write an equation for the beta decay of Pb-210.
Write an equation for the positron emission of C-18.
In what is the rate of decay of radioisotopes measured?
What is the change in atomic number from beta decay?
What is the change in atomic number from alpha decay?
49. What is the change in mass number from alpha decay?
50. What is the change in mass number from positron decay?
51. How much material would remain after 30 minutes if a radioisotope has a half-life of 10
minutes and the original amount is 100 g?
52. What is the half-life of a radioisotope that decays from 300 g to 18.75 g in 28 days?
53. What is the term for the combining of lighter nuclei into a larger nucleus?
54. What is the term for the splitting of a larger nucleus into two or more smaller nuclei?
55. What type of nuclear reaction is carried out in nuclear reactors to create energy?
56. What type of nuclear reaction occurs in the sun and stars?
57. Calculate the average atomic mass of bromine. The two isotopes of bromine have atomic
masses and relative abundance of 78.92 amu (50.69%) and 80.92 amu (49.31%).
58. How many hydrogen atoms are in each of the following?
a. C6H12O6
b. 2H2O
c. H2SO4
d. (NH4)2CO3
e. 2(NH4)2CO3