Topic 2 : Atomic Structure

Which statement about ⁵⁶Fe³⁺ and ⁵⁶Fe²⁺ is correct?

• Both have the same number of neutrons

• Both have the same number of protons

• Both have the same number of protons and neutrons

• Both have the same number of electrons and neutrons

Which shows the number of subatomic particles in ³¹P³⁻?

• 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 is correct for the line emission spectrum for hydrogen?

• Line M has a higher energy than line N.

• Line N has a lower frequency than line M.

• Line M has a longer wavelength than line N.

• Lines converge at lower energy.

Ultraviolet radiation has a shorter wavelength than infrared radiation. How does the frequency and energy of ultraviolet radiation compare with infrared radiation?

• A

• B

• C

• D

What is the relative atomic mass, 𝐴𝑟, of an element with this mass spectrum?

• 24.0

• 24.3

• 25.0

• 25.6

What is the condensed electron configuration of the Fe²⁺ ion?

• [Ar]3d⁶

• [Ar]3d⁴4s²

• [Ar]3d⁵4s¹

• [Ar]3d64s2

Which is the electron configuration of a chromium atom in the ground state?

• [Ar]4s¹3d⁶

• [Ar]3d³

• [Ar]4s²3d⁴

• [Ar]4s¹3d⁵

Which element is in group 13?

• A

• B

• C

• D

The graph represents the first ten ionisation energies (IE) of an element.

What is the element?

• O

• S

• Ne

• CI