S3.1 Periodicity Quiz

Which equation represents the first electron affinity of chlorine?

• Cl(g) + e^- → Cl^-(g)

• Cl₂(g) + e^- → Cl^-(g)

• Cl⁺(g) + e^- → Cl(g)

• Cl(g) → Cl⁺(g) + e^-

Which correctly describes the reaction between potassium and excess water?

• The reaction is endothermic (absorbs heat).

• The final products of the reaction are potassium oxide and hydrogen.

• The final products of the reaction are potassium hydroxide and hydrogen.

• The final pH of the solution is 7.

Which species has the largest radius?

• Cl-

• K

• Na+

• K+

What happens when sodium is added to water?

• A gas is evolved

• The temperature of the water increases

• A clear, colourless solution is formed

Which is the best definition of electronegativity?

• Electronegativity is the energy required for a gaseous atom to gain an electron.

• Electronegativity is the attraction of an atom for a bonding pair of electrons.

• Electronegativity is the attraction between the nucleus and the valence electrons of an atom.

• Electronegativity is the ability of an atom to attract electrons from another atom.

Which statement describes the trends of electronegativity values in the periodic table?

• Values increase from left to right across a period and increase down a group.

• Values increase from left to right across a period and decrease down a group.

• Values decrease from left to right across a period and increase down a group.

• Values decrease from left to right across a period and decrease down a group.

Which physical property of elements is represented by y on the graph below?

• First ionization energy

• Ionic radius

• Atomic radius

• Electronegativity

Which property generally decreases across period 3?

• Atomic number

• Electronegativity

• Atomic radius

• First ionization energy

Which pair of elements has the greatest difference in electronegativity?

• Cs and F

• Cs and Cl

• Cs and Br

• Cs and I

Which is correct?

• A

• B

• C

• D