ICSE Class 10 · Chemistry · Chapter 1

Periodic Table

Periodic Table, Periodic Properties and Variations of Properties is the opening chapter of the ICSE Class 10 Chemistry syllabus, and the one everything later depends on.

These 12 free lessons work through it in order: why elements needed classifying at all, how to read an element's group and period straight off the table, and then each periodic property in turn — atomic size, ionisation energy, electron affinity and electronegativity — with the trends across a period and down a group explained rather than simply listed.

Every lesson is interactive. Answer the questions on screen and check them as you go, reveal the worked answers when you are stuck, and download a print-ready PDF once you are done revising.

• 01The Modern Periodic Table

  Why classification was needed, and how to read an element's address.50–60 min

• 02Groups, Periods and Valency

  Electronic configurations, shells, and reading group and valency off them.65–75 min

• 03Periodicity

  What periodicity is, and why properties repeat.60–70 min

• 04Atomic Size and Atomic Radius

  Atomic radius defined, and the two factors that control it.75–85 min

• 05Metallic & Non-metallic Character

  Electron loss and gain, and how character shifts across the table.45–55 min

• 06Reactivity, Melting & Boiling Points

  Reactivity, melting and boiling points, and density trends.50–60 min

• 07Ionisation Energy

  Ionisation potential defined precisely, and what controls it.45–55 min

• 08Electron Affinity

  Electron affinity, its units, and the small-shell exceptions.45–55 min

• 09Electronegativity

  The Pauling scale, and the tug-of-war for shared electrons.50–60 min

• 10Atomic Number and Mass Number

  Z, A, and how to read the notation.45–55 min

• 11Alkali Metals and Halogens

  Group 1 and Group 17 compared side by side.75–85 min

• 12Periodic Table Revision & Practice

  Every definition, the trend tables, and full ICSE practice.85–95 min