Worksheets9th Period Unit 1 Test
Total questions: 15
Worksheet time: 8mins
Which subatomic particle has a positive charge?
Proton
Neutron
Electron
Photon
Which scientist is credited with discovering neutrons?
Dalton
Chadwick
Rutherford
Thomson
What is the sum of protons and neutrons in an atom called?
Atomic number
Atomic mass
Isotope number
Electron count
What is released during nuclear fission?
Gamma radiation only
Kinetic energy of daughter nuclei
Only neutrons
Only protons
What is the main difference between fission and fusion?
Fission combines nuclei, fusion splits them
Fission splits nuclei, fusion combines them
Both split nuclei
Both combine nuclei
What is the formula to calculate the average atomic mass of an element with multiple isotopes?
Add the masses of all isotopes and divide by the number of isotopes.
Multiply each isotope’s mass by its abundance, then add the results.
Subtract the smallest mass from the largest.
Multiply the atomic number by the mass number.
Which of the following is the correct hyphen notation for an isotope of Xenon with a mass number of 131?
Xenon-131
Xe-54
Xe-77
Xenon-54
What is the missing element in the nuclear reaction: 238 92 U → 234 90 Th + ?
4 2 He
2 4 He
1 0 n
0 -1 e
What is the missing element in the reaction 239 94 Pu → ? + 4 2 He?
235 92 U
235 92 Th
235 90 Th
235 94 U
Which process powers the sun and stars?
Fission
Fusion
Radioactive decay
Ionization
What is the sum of protons and neutrons in an atom called?
Atomic number
Atomic mass
Isotope number
Electron number
How do you determine the mass number of an isotope?
Add the number of protons and neutrons.
Multiply the number of protons by neutrons.
Subtract neutrons from protons.
Divide protons by neutrons.
What is the isotope notation for Xenon-131?
13154Xe
54131Xe
7754Xe
5477Xe
In the nuclear reaction 23892U → 23490Th + ?, what is the missing particle?
42He
24He
20He
40He
What is the atomic number of the element produced when 23892U undergoes alpha decay?
90
92
94
88
