gives the correct numbers of subatomic particles in an atom of an element with atomic number (Z) 48 and mass number (A) 120?  a. 48 protons, 48 electrons, 72 neutrons

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ChapterU1: Alchemy: Matter, Atomic Structure, And Bonding
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Which of the subsequent sets gives the correct numbers of subatomic particles in an atom of an element with atomic number (Z) 48 and mass number (A) 120? 
a. 48 protons, 48 electrons, 72 neutrons
b. 48 protons, 48 electrons, 120 neutrons
c. 72 protons, 48 electrons, 48 neutrons
d. 72 protons, 48 electrons, 72 neutrons
 
What theory states that only a maximum of two electrons can occupy an orbital? 
a. Pauli's exclusion principle
b. Principal quantum number
c. Heisenberg's uncertainty principle
d. Hund's rule
 
If a particular isotope of Manganese has a number of neutrons (n) of 28, what is its mass number? 
a. 53
b. 52
c. 51
d. 50
 
If n=10, what are the possible values of ℓ? 
a. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
b. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
c. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
d. 1, 2, 3, 4, 5, 6, 7, 8, 9
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