Group 2 — A-Level Chemistry Revision
Revise Group 2 for A-Level Chemistry. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Group 7 (Halogens)What is Group 2?
The Group 2 elements, or alkaline earth metals, are characterised by having two electrons in their outer s-orbital. This topic explores the trends in their properties, such as atomic radius, ionisation energy, and reactivity, which generally increases down the group. The chemistry of their compounds is also studied, including the trend in solubility of their hydroxides (increases down the group) and sulfates (decreases down the group), and their use in various applications like agriculture and medicine.
Board notes: All boards cover the trends in properties and reactions of Group 2 elements. AQA often includes questions on the use of magnesium in the extraction of titanium and the use of calcium hydroxide in agriculture. Edexcel may focus on the thermal stability of Group 2 carbonates and nitrates. OCR frequently tests the solubility trends and the use of barium sulfate in medicine.
Step-by-step explanationWorked example
Write an equation for the reaction of strontium with water and state the trend in reactivity of Group 2 metals with water. Step 1: Strontium is a Group 2 metal, so it will react with water to form the metal hydroxide and hydrogen gas. Step 2: The equation is Sr(s) + 2H2O(l) -> Sr(OH)2(aq) + H2(g). Step 3: Reactivity with water increases down Group 2 because the first and second ionisation energies decrease, making it easier for the atoms to be oxidised and lose two electrons.
Mini lesson for Group 2
1. Understand the core idea
The Group 2 elements, or alkaline earth metals, are characterised by having two electrons in their outer s-orbital. This topic explores the trends in their properties, such as atomic radius, ionisation energy, and reactivity, which generally increases down the group.
Can you explain Group 2 without copying the notes?
2. Turn it into marks
Write an equation for the reaction of strontium with water and state the trend in reactivity of Group 2 metals with water. Step 1: Strontium is a Group 2 metal, so it will react with water to form the metal hydroxide and hydrogen gas.
Underline the method, evidence, or command-word move that would earn credit in A-Level Inorganic Chemistry.
3. Fix the likely mark leak
Watch for this mistake: Confusing the reactivity trend with the ionisation energy trend. Reactivity increases down the group because the ionisation energy decreases, making it easier for the atoms to lose their two outer electrons.
Write one correction rule before doing another practice question.
Practise this topic
Jump into adaptive, exam-style questions for Group 2. Free to start; sign in to save progress.
Group 2 practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one A-Level sentence, explain what Group 2 is testing.
Answer: The Group 2 elements, or alkaline earth metals, are characterised by having two electrons in their outer s-orbital. This topic explores the trends in their properties, such as atomic radius, ionisation energy, and reactivity, which generally increases down the group.
Mark focus: Precise definition and topic focus.
Question 2
A Group 2 question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing the reactivity trend with the ionisation energy trend. Reactivity increases down the group because the ionisation energy decreases, making it easier for the atoms to lose their two outer electrons." What should their next repair task be?
Answer: Do one Group 2 question and review the mistake type.
Mark focus: Error correction and next-step practice.
Group 2 flashcards
Core idea
What is the main idea in Group 2?
The Group 2 elements, or alkaline earth metals, are characterised by having two electrons in their outer s-orbital. This topic explores the trends in their properties, such as atomic radius, ionisation energy, and rea...
Common mistake
What mistake should you avoid in Group 2?
Confusing the reactivity trend with the ionisation energy trend. Reactivity increases down the group because the ionisation energy decreases, making it easier for the atoms to lose their two outer electrons.
Practice
What is one useful practice task for Group 2?
Answer one Group 2 question and review the mistake type.
Exam board
How should you use board notes for Group 2?
All boards cover the trends in properties and reactions of Group 2 elements. AQA often includes questions on the use of magnesium in the extraction of titanium and the use of calcium hydroxide in agriculture.
Common mistakes
- 1Confusing the reactivity trend with the ionisation energy trend. Reactivity increases down the group because the ionisation energy decreases, making it easier for the atoms to lose their two outer electrons.
- 2Mixing up the solubility trends for the hydroxides and sulfates. A simple mnemonic is that the solubility of hydroxides gets 'Heavier' (more soluble) down the group, while sulfates get 'Lighter' (less soluble).
- 3Forgetting that magnesium reacts only slowly with cold water. Unlike the elements below it in Group 2, magnesium requires steam for a vigorous reaction, forming magnesium oxide and hydrogen, whereas with liquid water it forms magnesium hydroxide.
Group 2 exam questions
Exam-style questions for Group 2 with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Group 2
Core concept
The Group 2 elements, or alkaline earth metals, are characterised by having two electrons in their outer s-orbital. This topic explores the trends in their properties, such as atomic radius, ionisatio…
Frequently asked questions
Why are Group 2 elements called alkaline earth metals?
They are called 'alkaline' because their oxides and hydroxides are alkaline in nature. They are called 'earth metals' because their compounds are common in the Earth's crust and are stable at high temperatures.
What is the use of barium sulfate in medicine?
Barium sulfate is used as a 'barium meal' in medical imaging. It is opaque to X-rays and, despite barium compounds being toxic, it is safe to ingest because it is insoluble in water and stomach acid, allowing the digestive tract to be visualised on an X-ray.