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 and OCR.
At a glance
- What StudyVector is
- An exam-practice platform with board-aligned questions, explanations, and adaptive next steps.
- This topic
- Group 2 in A-Level Chemistry: explanation, examples, and practice links on this page.
- Who it’s for
- Students revising A-Level Chemistry for UK exams.
- Exam boards
- Practice is aligned to major specifications (AQA, Edexcel, OCR, WJEC, Eduqas, Cambridge International (CIE), SQA, IB, AP).
- Free plan
- Sign up free to use tutor paths and full feedback on your answers. Pricing
- What makes it different
- Syllabus-shaped practice and progress tracking—not generic AI answers.
Topic has curated content entry with explanation, mistakes, and worked example. [auto-gate:promote; score=75.25]
Next in this topic area
Next step: Group 7 (Halogens)
Continue in the same course — structured practice and explanations on StudyVector.
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.
Practise this topic
Jump into adaptive, exam-style questions for Group 2. Free to start; sign in to save progress.
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 and OCR specifications.
Group 2 exam questionsGet help with Group 2
Get a personalised explanation for Group 2 from the StudyVector tutor. Ask follow-up questions and work through problems with step-by-step support.
Open tutorFree full access to Group 2
Sign up in 30 seconds to unlock step-by-step explanations, exam-style practice, instant feedback and on-demand coaching — completely free, no card required.
Try a practice question
Unlock Group 2 practice questions
Get instant feedback, step-by-step help and exam-style practice — free, no card needed.
Start Free — No Card NeededAlready have an account? Log in
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.