Group I properties

Caesium belongs to Group I metals. Which reaction involving this element would fail to produce hydrogen?

May/June 2015

A small piece of sodium is put on the surface of water. It reacts, and a solution forms.

May/June 2015

The elements in Group I of the Periodic Table exhibit patterns in both reactivity and melting point. Rubidium belongs to Group I. Which statement about rubidium is correct?

May/June 2021

Group I elements and transition elements are metals. Student X proposes that the Group I elements are positioned above hydrogen in the metal reactivity series, whereas not every transition element is. Student Y proposes that the densities of Group I elements are less than those of the transition elements. Which students are right?

May/June 2021

The proton number of caesium is $55$. Relative to lithium, caesium has a ......1...... melting point, and its reaction with water is ......2...... vigorous. Caesium has ......3...... valence electrons than lithium. Which words correctly fill gaps 1, 2 and 3?

May/June 2021

The carbonates of metals $W$, $X$ and $Y$ are heated, and the outcomes are shown. These test results can be used to make statements about $W$, $X$ and $Y$. Which of the statements are correct?

May/June 2022

Group I is made up of the elements lithium, sodium and potassium.

May/June 2023

The table shows a comparison of two properties of lithium and potassium. Which row is correct?

May/June 2024

Sodium is placed into water and reacts chemically. The products are hydrogen and aqueous sodium hydroxide. Which row gives the reactants and products in this reaction?

May/June 2025

Rubidium belongs to Group I of the Periodic Table. Which statement concerning rubidium is correct?

May/June 2025

Rubidium and caesium are both elements in Group I of the Periodic Table. Which comparison between rubidium and caesium is correct?

May/June 2025

A piece of element $X$ can be sliced with a knife. As $X$ reacts with water, it floats and becomes molten. Which element is $X$?

Oct/Nov 2016

A piece of element X can be sliced with a knife. When X reacts with water, it floats and becomes molten. Identify X.

Oct/Nov 2016

Sodium and rubidium are part of the alkali metals.

Oct/Nov 2016

Which of the following statements about Group I metals is true?

Oct/Nov 2017

A metal’s carbonate, chloride and sulfate are all soluble in water. Which metal is it?

Oct/Nov 2018

The Group I metals lithium, sodium and potassium display patterns in their melting points and in how they react with water. Which statement is correct as you move down the group from lithium to potassium?

Oct/Nov 2018

The elements in Group I exhibit similar chemical properties. Which statement accounts for this?

Oct/Nov 2019

The table lists several properties for four Group I elements.

Oct/Nov 2019

Name one more naturally occurring substance in water that is neither a mineral salt nor a pollutant.

Oct/Nov 2020

Silver is a transition element. Potassium is a Group I metal in the Periodic Table. State two differences between the physical properties of silver and potassium.

Oct/Nov 2021

A small metal sample is dropped into a large beaker of water. A very vigorous reaction takes place. Once the reaction has finished, a few drops of litmus are added to the solution. What is the metal and which colour is the solution after the litmus is added?

Oct/Nov 2023

Element X belongs to Group I. A few facts about element X are listed below. • X is not the Group I element with the lowest density. • X is more reactive than potassium. • X has an $A_r$ value below $100$. Which element is X?

Oct/Nov 2024

The Group I metals lithium, sodium and potassium display patterns in their melting points and in how they react with water. Which statement is correct as you move down the group from lithium to potassium?

Oct/Nov 2025