CHEM 101 Ch 4 Mastering

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Sort the following elements by the number of protons in an atom of each.

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Sort the following elements by the number of protons in an atom of each.

2: He
4: Be
10: Ne
27: Co
59: Pr
112: Cn

Determine the number of neutrons in each of the following atoms given the mass number and atomic number.

1. An atom of oxygen with a mass number of 17 and an atomic number of 8 has a total of 9 neutrons.
2. An atom of aluminum with a mass number of 24 and an atomic number of 13 has a total of 11 neutrons.
3. An atom of phosphorous with a mass number of 31 and an atomic number of 15 has a total of 16 neutrons.
4. An atom of potassium with a mass number of 39 and an atomic number of 19 has a total of 20 neutrons.
5. An atom of fluorine with a mass number of 19 and an atomic number of 9 has a total of 10 neutrons.

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Which statement about protons is true?
Protons have twice the magnitude of charge as electrons and are the same in sign.
Protons have a charge of 1+.
Most atoms have more protons than electrons.
Protons have twice the mass of neutrons.

Protons have a charge of 1+.

Find the atomic number Fr

Find the atomic number Kr