Atomic History
What subatomic particle did Thomson discover and with what experiment?
Electron, Cathode Ray Experiment
What is the atomic number of C-12
6
Does fusion or fission split heavy nuclei?
Fission
What is the decay mode of K-42?
Beta
What is the half-life of Ra-226?
1600 years
Describe an orbital
Which of these is an isotope of K-39?
K-40
Cl-39
K-39
K-40
Does fission or fusion produce more energy?
Fusion
Fill in the blank:
22087Fr-> ______ + 42He
21685At
A 40.0g sample of Cs-137 decays over 60.46 years. How much is left at the end?
10.0g
What did Bohr add to Rutherford's model of the atom?
Energy levels/electron shells
What is the nuclear charge of O-16?
+8
Which of these is fusion, and which is fission?
A) 31H + 11H -> 42He
B) 235U -> 42He + 231Th
A) Fusion
B) Fission
Fill in all of the missing spots
32P -> 0e + 16S
3215P -> 0-1e + 3216S
A 5.00g substance of K-42 has undergone decay over the last 37.2 hours. What was its original mass?
40.0g
What were Rutherford's two discoveries? What was his experiment?
Atom is mostly empty space and there is a small dense center. Experiment: Gold foil
What is the atomic mass of Phosphorus if P-31 has an abundance of 93% and P-30 has an abundance of 7%?
30.93amu
Describe transmutation
A change that converts one element into another
Write the decay equation for Pu-239
23994Pu -> 42He + 23592U
A 80.0g amount of Co-60 decays to 10.0g. How much time has passed?
15.8 years
Put these events in the correct order
A. Discovery of the electron
B. Discovery of orbitals
C. Discovery of the nucleus
D. Atom is and indivisible sphere
D-> A-> C-> B
Find the number of protons, neutrons, and electrons in an ion of Cl-35 if it has a charge of -1
P: 17
N: 18
E: 18
Which of the following is artificial transmutation?
A) 31H + 11H -> 42He
B) 235U -> 42He + 231Th
C) 10B + 42He -> 13N + 10n
D) 14C -> 14N + 0-1e
C
Write the decay equation for Ne-19
1910Ne -> 0+1e + 199F
A sample of Sr-90 decays over the course of 56.2 years. What fraction of it is left at the end?
1/4