What are the smaller particles called that make up both protons and neutrons?
quarks
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10
How is mass number for an atom determined?
number of protons + number of neutrons
OR
atomic number + number of neutrons
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10
How is the number of protons for an atom determined?
Look at the atomic number on the periodic table.
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thief
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rocket
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banana
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20
What is the most common isotope for the following atom. Explain how you know.
Na-23; The average atomic mass is 22.9, which would round to 23. Sodium is most commonly found with a mass of 23.
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monster
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fairy
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banana
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5
Which particles are found in the cloud that surrounds the nucleus?
electrons
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5
What is the charge of a neutron?
0 (neutral)
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20
Explain how to write an abbreviated electron configuration.
Located the noble gas that comes in the period before the desired atom, write its symbol in brackets, and count/summarize each orbital section until finished.
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10
What does the group number tell about an atom?
The number of valence electrons present.
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15
What is unique about the elements in group 18?
They have 8 valence electrons, so they are stable and will not readily form bonds with other atoms.
