Groups in the periodic table：练习题

Which of the following elements is a halogen that is a grey solid at room temperature?

In a displacement reaction between chlorine gas and potassium bromide solution, which species is oxidised?

Explain why the noble gases in Group 0 are chemically inert in terms of their electronic configurations.

When chlorine gas is added to a solution of potassium bromide, a displacement reaction occurs.
Write the balanced ionic equation for this reaction and identify which species is being oxidized.

Explain the pattern in reactivity of Group 1 alkali metals (lithium, sodium, and potassium) with water as you move down the group, in terms of their electronic configurations.

a) Explain the difference between the physical properties of the Group 1 alkali metals and the Group 7 halogens, specifically referring to their melting points and densities.
b) Chlorine gas is bubbled through a solution of potassium bromide.
(i) State the colour change observed in the solution.
(ii) Write a balanced chemical equation for this reaction.
(iii) Explain, in terms of electronic configurations, why chlorine is more reactive than bromine.