IB Chem S1.3 Electron configuration

Which electronic transition occurs when a gaseous hydrogen atom in its ground state is ionized?

• n = ∞ → n = 1

• n = 2 → n = ∞

• n = 1 → n = ∞

• n = ∞ → n = 2

Which are used to explain and deduce the electron configuration of an element?

I. The aufbau principle

II. Hund's rule

III. Pauli exclusion principle

• I, II and III

• I and II only

• II and III only

• I and III only

Which series of transitions occur to produce the discrete lines that occur in the visible region of the emission spectrum of hydrogen?

• n = 3, 4, 5, 6 ... → n = 2

• n = 2, 3, 4, 5 ... → n = 1

• n = 1 → n = 2, 3, 4, 5 ...

• n = 2 → n = 3, 4, 5, 6 ...

The main energy levels occupied by electrons in an atom are designated by the letter n. What does n stand for?

• Number

• Principle quantum number

• Natural number

• Nuclear number

How many orbitals are present in the n = 3 main energy level?

• 7

• 3

• 9

• 12

What is the electron configuration of bromine?

• 1s²2s²2p⁶3s²3p⁶4s²4p⁵

• [Ar]3s²3d¹⁰3p⁵

• 1s²2s²2p⁶3s²3p⁵

• [Ar]4s²3d¹⁰4p⁵

Which is the correct orbital diagram (arrows in boxes) for a carbon atom?

• 
• 
• 
• 

• II and III only

• I and III only

• I, II and III

• I and II only

Which is the correct orbital diagram (arrows in boxes) for the 4s and 3d orbitals in the Fe³⁺ ion?

• 
• 
• 
• 

What is the electron configuration of a copper atom?

• 1s²2s²2p⁶3s²3p⁶4s¹3d¹⁰

• 1s²2s²2p⁶3s²3p⁶4s²3d⁹

• 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• 1s²2s²2p⁶3s²3p⁶3d⁹