U1E2 Review

In the periodic table, which elements typically have similar properties?

• those in the same groups

• those in the same periods

• those on opposite sides

• those related diagonally

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The angular momentum quantum number, ℓ, provides us with information about which characteristic of an electron bound in an atom?

• energy level

• particle charge

• orbital shape

• electron spin

Which of the following statements is NOT true?

• n is the principal quantum number

• mℓ has only two possible values, +1/2 and −1/2

• ℓ can have integral values from 0 to n - 1

• n can have integral values from 1 to infinity

Which of the following sets of quantum numbers are invalid, i.e., violate one or more boundary conditions?

• a) I only

• b) II, III

• c) III only

• d) I,II, III

How many electrons could be described by the quantum numbers n = 2 and ms = +1/2?

• a) 1

• b) 2

• c) 4

• d) 8

Quantum numbers and periodic table: The n and ℓ quantum numbers of the valence electron (i.e., outermost electron) of an element are n = 4 and ℓ = 0. The element is _______.

• Carbon

• Calcium

• Beryllium

• Bromine

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Aufbau, Hund & Pauli theory: For a given atom, how many electrons can occupy the 3d set of orbitals?

• 2

• 6

• 8

• 10

Aufbau, Hund & Pauli theory: Which electron configuration violates only the Pauli exclusion principle?

• 
• 
• 
• 

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What is the electronic configuration of a selenium atom (Se)?

• [Ar] 4s²3d¹⁰4p⁴

• [Ar] 4s²4d¹⁰4p⁴

• [Ar] 4s²3d¹⁰4p⁴

• [Kr] 4s²4f¹4d¹⁰4p⁴

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What is the correct electronic configuration of magnesium, Mg?

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²

• 1s²2s²2p²3s²

• 1s²2s²4p⁶

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