Group I properties：练习题

Which of the following describes the general trend in reactivity of the alkali metals as you go down Group I?

Which statement describes the trend in reactivity and melting point of the alkali metals as the atomic number increases?

Rubidium (Rb) is a Group I metal located below Potassium (K). Which of the following is a correct prediction of its properties compared to Potassium?

Why are Group I metals, such as sodium and potassium, typically stored submerged in oil?

Caesium (\(Cs\)) is a Group I element located below Rubidium (\(Rb\)) in the Periodic Table. Based on the trends in Group I, which property is correct for Caesium?

Describe the trend in melting point of Group I alkali metals as the atomic number increases.

Describe the observations when a small piece of sodium is added to a trough of water containing universal indicator, and state the final color of the indicator.

Group I elements, also known as alkali metals, show specific patterns in their physical properties as the atomic number increases.

(a) State three physical trends observed in Group I elements as you move down the group from lithium to francium.
(b) Explain why these metals must be stored under oil.

Sodium (Group I) reacts vigorously with Chlorine (Group VII) to form a white crystalline solid, sodium chloride.

(a) Describe two observations made during this reaction.
(b) Describe the formation of the bond in sodium chloride in terms of electron transfer.
(c) Sodium chloride has a high melting point (801 \(^{\circ}C\)). Explain this property in terms of its structure and bonding.