AQA A-Level Revision: Atomic Structure Multiple Choice

Which of these atoms has the largest atomic radius?

• Ar

• Cl

• Mg

• Na

Which of these atoms has the smallest number of neutrons?

• ³H

• ⁴He

• ⁵He

• ⁴Li

Which change requires the largest amount of energy?

• He⁺(g) -----> He²⁺(g) + e^-

• Li(g) -----> Li⁺(g) + e^-

• Mg⁺(g) -----> Mg²⁺(g) + e^-

• N(g) -----> N⁺(g) + e^-

Below is a simplified redox equilibrium of photochromic glass which contains silver ions and copper ions.

Cu⁺(s) + Ag⁺(s) <-----> Cu²⁺(s) + Ag(s)

Which one of the following is a correct electron arrangement?

• Cu⁺ is [Ar]3d⁹4s¹

• Cu is [Ar]3d¹⁰4s²

• Cu²⁺ is [Ar]3d¹⁰4s¹

• Cu⁺ is [Ar]3d¹⁰

Chlorine has two isotopes, ³⁵Cl and ³⁷Cl. The number of molecular peaks in the mass spectrum of a sample of Cl₂ is...

• 2

• 3

• 4

• 5

Which one of the following statements is not correct?

• The first ionisation energy of iron is greater than its second ionisation energy.

• The magnitude of the lattice enthalpy of magnesium oxide is greater than that of barium oxide.

• The oxidation state of iron in [Fe(CN)₆]^3- is greater than the oxidation state of copper in [CuCl₂]^-.

• The boiling point of C₃H₈ is lower than that of CH₃CH₂OH.

Which one of the following is the electronic configuration of the strongest reducing agent?

• 1s²2s²2p⁵

• 1s²2s²2p⁶3s²

• 1s²2s²2p⁶3s²3p⁵

• 1s²2s²2p⁶3s²3p⁶4s²

An atom in which the number of protons is greater than the number of neutrons is...

• ²³⁴U

• ⁶Li

• ³He

• ²H

Assuming that chlorine exists as two isotopes, and that hydrogen and carbon exist as one isotope each, how many molecular ion peaks will be shown in the mass spectrum of C₄H₆Cl₄?

• 2

• 3

• 4

• 5

Which one of the following atoms has only two unpaired electrons in its ground (lowest energy) state?

• helium

• beryllium

• nitrogen

• oxygen