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WorksheetsUnit 2 Review: Atoms
Total questions: 20
Worksheet time: 10mins
The existence of atoms was discovered...
by one scientist
by two scientists
by many scientists over hundreds of years
quickly over a thousand years ago
Scientists know the structure of the atom exactly because they have seen atoms under a microscope.
True
False
Which particles have a negative charge?
protons
neutrons
electrons
all of the particles
Inside the nucleus you will find:
Protons and neutrons
Protons and electrons
Electrons and neutrons
Only electrons
Using the image of carbon from the periodic table, find how many protons carbon has.
6 protons
12 protons
18 protons
There's no way to know
The atomic number of an element is the same as its...
number of electrons
number of neutrons
number of protons
What determines an atom's identity?
Number of protons
Number of neutrons
Number of neutrons
Protons + Neutrons
The mass of an atom comes from...
its protons only
neutrons only
electrons only
protons + neutrons
What is an isotope?
An atom with a different number of electrons
An atom with a different number of protons
An atom with a different number of neutrons
What is true about this model of the atom?
This model is totally useless and incorrect
This model is useful but not perfect
PROTONS + NEUTRONS =
mass number
atomic number
isotope
When you add protons and neutrons to get the atom's mass, your answer will always be...
a fraction
a whole number
more than 10
less than 10
Why is the atomic mass listed for carbon (12.0107) not a whole number?
The number is an average
The number is wrong
The number includes electrons
An atom might be radioactive when...
it has too many electrons
its nucleus is unstable
its small
its has a negative charge
Radioactive decay can release...
Protons
Neutrons
Both protons and neutrons
Radioactivity:
is always harmful
can be used for good
Which involves the splitting of a nucleus into two smaller atoms?
Fusion
Fission
Radioactive decay
Which of the following release energy?
Fission
Fusion
Radioactive decay
All of the above
Radioactivity can be used for...
treating cancer
medical imaging
finding the age of artifacts
all of the above
Protons, neutrons, and electrons are the smallest particles we know of
Yes - they are the smallest
No - these particles are made of even smaller particles
