Topic 12 HL Atomic Structure Questions

Which represents the shape of an s atomic orbital?

• A

• B

• C

• D

Which transition in the hydrogen atom emits visible light?

• n = 1 to n = 2

• n = 2 to n = 3

• n = 2 to n = 1

• n = 3 to n = 2

Which shows the first ionization energies of successive elements across period 2, from left to right?

• A

• B

• C

• D

What is the ground state electron configuration of an atom of chromium, Cr (Z = 24)?

• [Ar] 3d⁶

• [Ar] 4s²3d⁴

• [Ar] 4s¹3d⁵

• [Ar] 4s²4p⁴

Which of the following transitions in the hydrogen atom emits the least energy?

• n = 2 to n = 1

• n = 3 to n = 1

• n = 4 to n = 2

• n = 4 to n = 3

Which statements are correct for the emission spectrum of hydrogen?

I. The lines converge at higher frequencies.

II. Electron transitions to n = 2 are responsible for lines in the visible region.

III. Lines are produced when electrons move from lower to higher energy levels.

• I and II only

• I and III only

• II and III only

• I, II and III

Which are correct statements about the emission spectrum of hydrogen in the visible region?

I. The red line has a lower energy than the blue line.

II. The lines converge at longer wavelength.

III. The frequency of the blue line is greater than the frequency of the red line.

• I and II only

• I and III only

• II and III only

• I, II and III

The values for the first three successive ionization energies for two elements X and Z are given.

Which pair of elements represents X and Z?

• X is Li and Z is Be

• X is Li and Z is C

• X is Be and Z is Li

• X is Be and Z is C

Which transition on the diagram corresponds to the ionization of hydrogen in the ground state?

• A

• B

• C

• D

The graph shows the first ionization energies of some consecutive elements.

Which statement is correct?

• Y is in group 3

• Y is in group 10

• X is in group 5

• X is in group 18