Audio uses your browser's speech synthesis. An Indian English voice is preferred when available. Voice availability depends on your device and browser.
Audio uses your browser's speech synthesis. An Indian English
voice is selected when your device provides one. Voice availability
depends on your browser and installed voices.
Choose any topic from the index. Read its explanation, learn its uses, listen to the audio narration, and practise the important question and answer.
Audio uses your browser's speech synthesis. Available voices and pronunciation depend on your device.
🗂️ Clickable Index
Groups 1–8
Groups 9–18
Inner Transition Series
Welcome to the Periodic Table!
Select any group from the index above to begin your learning journey.
The modern periodic table contains 18 groups and 7 periods. Lanthanides and actinides are commonly shown in two separate rows below the main table.
🎯 Quick Revision
Important Question:
Why do elements in the same group generally have similar chemical properties?
Answer: Elements in the same group generally have similar outer-shell electron configurations. For main-group elements, they have the same number of valence electrons, which strongly influences their chemical properties.
Audio uses your browser's speech synthesis. An English (India)
voice is preferred if available on your device.
Educational note: Uses listed here are examples, not instructions for
handling chemicals. Some compounds are hazardous and require trained
supervision.