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Worksheets4.09 Unit Review: Atoms
Total questions: 25
Worksheet time: 2hrs 5mins
What is the basic building block of matter?
The atom
The proton
The neutron
The electron
Which particle as a negative charge?
The nucleus
The proton
The neutron
The electron
Which particle has the smallest amount of mass?
The neutron
The proton
The nucleus
The electron
Which model is defined as the atomic model that describes an atom as a spherical object containing a certain number of electrons trapped in a massive positive charge?
The electron cloud model
The raisin bread model
The molecular model
The nuclear model
What is the first nucleus of an atom shown as?
A mass of protons and neutrons
A mass of protons
A solid mass surrounded by electrons
A fuzzy cloud
What does the electron cloud model describe?
Rapidly moving nuclei
Rapidly moving electrons
Rapidly moving neutrons
Rapidly moving protons
Which statement is completely accurate?
Atoms of the same element always have different numbers of neutrons.
Atoms of the same element can have different numbers of neutrons.
Atoms of the same element always have different atomic weights.
Atoms of the same element can have neutrons but exist without protons.
What is the atomic number of an oxygen atom that has 8 protons in its nucleus?
4
6
8
12
What is a substance that cannot be broken down chemically into a simpler substance?
An element
An atom
A molecule
A compound
What is the atomic mass of an oxygen isotope that has 8 protons and 10 neutrons in its nucleus?
8amu
10amu
18amu
How is atomic mass calculated?
By adding the mass of the protons and neutrons
By adding the mass of the electrons and protons
By subtracting the mass of the protons from the mass number
By subtracting the mass of the neutrons from the mass number
Which term describes elements with different atomic masses due to varying numbers of neutrons?
Atomic mass units
Isotopes
Atoms
Nuclei
What is the atomic mass of a carbon isotope that has 6 protons and 7 neutrons?
6amu
7amu
13amu
Which term is defined as the fundamental particles of protons and neutrons?
Molecules
Electrons
Nucleons
Quarks
What is the atomic nucleus made of?
Nucleons
Only protons
Only neutrons
Electrons
What is the nucleus held together by?
The attraction between the electrons inside the nucleus
The attraction between the quarks in the protons and neutrons
The electromagnetic attraction between two protons
The electromagnetic attraction between two neutrons
What does radioactive decay do?
Radioactive decay has no effect on temperature.
Radioactive decay absorbs heat.
Radioactive decay gives off heat.
Why would an atomic nucleus give off a particle?
To emit radiation
To become stable
To change atomic number
To increase atomic mass
When does an element become a different element?
When radiation is emitted
When the number of neutrons in the nucleus decreases
Only when the number of electrons in the outer shell changes
Only when the number of protons in the nucleus changes
Which term is defined by the loss of a particle, such as a proton, as an atom tries to become stable?
Radiation
Radioactive decay
An isotope
Ionization
What can be determined about the half-life of a substance if it is emitting radiation very slowly?
The substance has a long half-life.
The substance has a short half-life.
The substance has no half-life.
Which term is defined as the amount of time it takes for half a radioactive substance to decay?
Decay time
Stability time
Isotope time
Half-life
What is the best definition of nuclear fission?
The splitting of the atomic nucleus into parts
The process of two or more atomic particles sticking together to form a heavier atomic nucleus
The creation of high-energy plasma
What is the best definition of nuclear fusion?
The splitting of the atomic nucleus into parts
The process of two or more atomic particles sticking together to form a heavier atomic nucleus
The creation of high-energy plasma
What are elements formed from?
Nuclear fusion in molten lava
Nuclear fusion in rocks and minerals
Nuclear fission in stars
Nuclear fusion in stars
