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Physical Science: 4.10: Unit Test: Atoms
Final Grade: 100%
Terms in this set (18)
Which statement best describes the electrons in this illustration?
The electrons are negatively charged particles located outside the nucleus.
What is the most basic building block of matter?
Which part of an atom has a negative charge?
What best describes the mass of an electron?
not significant to the overall mass of the atom
How many protons are in this atom if it has a balanced charge?
6 red mixed with 6 blue
2 negatives on left and right
1 negative at the top and bottom.
What does the electron cloud model describe?
location where an electron has the highest probability of being found
What is the atomic number of an oxygen atom with 8 protons and 10 neutrons in its nucleus?
What happens if an atom loses a neutron?
Its mass is lowered, but it is still the same element.
Which term is defined as a substance that cannot be broken down chemically into a simpler substance?
Which term is defined as the sum of protons and neutrons in an atomic number?
Which term describes atoms with different atomic masses due to varying numbers of neutrons?
Which term is defined by the amount of a certain isotope that occurs in a natural sample of an element?
What are protons and neutrons compromised of?
What is the correct definition of a half-life?
the amount of time it takes for half of a radioactive substance to decay
What is the correct definition of nuclear fission?
the splitting of the atomic nucleus into parts
What are carbon-12, carbon-13, and carbon-14?
different isotopes of the same element
When does radioactive decay occur?
when the nucleus decays
Why does radioactive decay occur?
The electric force and nuclear forces are in opposition to each other.
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