Class 11 chemistry · linked to Periodic table and periodicity · Conceptual practice
Source: CBSE Class 11 chemistry practical syllabus · use your school laboratory manual (NCERT Lab Manual where your school uses it).
Periodic trends comparison (Class 11 chemistry practical)
You use the periodic table to predict and then check qualitative trends.
If your manual prints numerical IE or radius values, use those. This page does not invent a data table.
Published practice page. Concentrations, masses, and numerical answers come from your school laboratory manual and your own readings — not invented here. Not yet reviewed by a named chemistry reviewer. Version 1.0.0, updated 2026-10-03.
Safety — read before you start
Safety warning. Practise here. Perform the real experiment only in your school lab, with your teacher present.
- Table exercise only on this page. Live alkali-metal demos are highly hazardous.
Wear: Lab coat, Splash goggles, Gloves, as your teacher directs.
Follow your teacher’s disposal instructions. Do not pour leftovers down a household drain.
Loads only after you tap. Drag to orbit the teaching model. Falls back to a flat diagram if WebGL is unavailable.
Aim
To compare selected elements across a period and down a group for atomic size, ionisation enthalpy, electronegativity, and metallic character, using only data your teacher or manual supplies.
Methods and quantities can differ between schools. Follow your teacher's instructions.
Apparatus and chemicals
| Item | Note |
|---|---|
| Periodic table | School / exam table. |
| Data sheet from manual (if any) | Do not replace it with random internet values. |
| None required for the table exercise (none) | Metal reactivity demos (if any) are separate and teacher-led. |
Picture guide
Theory and reaction
Open
Across a period: size generally ↓, IE and electronegativity generally ↑, metallic character ↓.
Down a group: size ↑, IE and electronegativity generally ↓, metallic character ↑ for metals.
Flag known exceptions (Be/N IE bumps, F vs Cl electron-gain) when your syllabus requires them.
First ionisation: M gas to M+ gas plus electron.
Procedure
- Your teacher names one period strip (e.g. Na→Ar) and one group strip (e.g. Li→K).
- Predict relative size and IE order before looking at any printed numbers.
- Fill the observation table with predictions, then with manual values if provided.
- Write one sentence on oxide acid–base trend across your period strip.
- Note one diagonal relationship pair if asked (Li–Mg, Be–Al, …).
Observation table
Enter the readings from your school lab in the practical file below. This page does not fill them in for you.
Calculation
No titre. Ranking only — unless your manual asks for a numerical difference using its printed values.
Result
State the trend orders you verified for the strips assigned in class.
Precautions
- Do not invent IE or radius numbers for your file.
- Keep metal/water demos behind the teacher’s safety protocol.
Viva questions
Answer one question at a time. The full answers stay closed until you open them.
Question 1 of 3
Modern periodic law arranges elements by…
Pick an answer first.
Show all questions and answers
Modern periodic law arranges elements by…
Answer: Atomic number. Reason: Properties are periodic functions of atomic number.
Across a period, atomic size generally…
Answer: Decreases. Reason: Nuclear charge rises while electrons enter the same shell.
s-block elements are Groups…
Answer: 1–2. Reason: Groups 1 and 2.
Common mistakes
- Saying IE always increases with no exceptions.
- Confusing electron gain enthalpy with electronegativity.
- Using atomic number order as if it automatically fixed every chemical trend.
Frequently asked questions
- Can I do this at home?
- No. Use this page to practise the order of ideas and steps. Do the real experiment only in your school laboratory, with your teacher present.
Your practical file
Name, school, and roll number are optional and are not sent anywhere.
The practical file opens on this device.
Review
Not yet reviewed by a named chemistry reviewer. Published for practice only — follow your teacher and laboratory manual for quantities and safety.
Related notes
Related practicals
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