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The periodic table: Classification of elements- IB DP Chemistry- Study Notes | IITian Academy

The periodic table: Classification of elements - IB DP Chemistry- Study Notes - New Syllabus 2025

The periodic table: Classification of elements- IB DP Chemistry- Study Notes

IITian Academy excellent Introduction to the Particulate Nature of Matter – Study Notes and effective strategies will help you prepare for your IB DP Chemistry 2025 exam.

IB DP Chemistry Study Notes – All Topics

S3.1.1-2 – Geography of the Periodic Table

Groups and Periods in the Periodic Table:

  • Horizontal rows in the periodic table are called Periods
  • Vertical columns in the periodic table are called Groups
  • Elements in a group have similar chemical properties

Blocks in the Periodic Table:

  • 4 blocks: s, p, d, and f
  • Block are arranged depending on their valence electron arrangement
  • Example: Group 1 and 2 elements have valence electrons in the s sublevel, thus putting them in the s block.

Metals, Metalloids, and Nonmetals in the Periodic Table:

Some Important Families/Groups:

  • Group 1 – Alkali Metals
  • Group 2 – Alkaline Earth Metals
  • Group 17 – Halogens
  • Group 18 – Noble Gases

Group Number and Valence Electrons:

  • Number of the principle energy level and the number of valence electrons in an atom
  • Can be deduced from its position on the periodic table

The Position of an Element in Periodic Table and Electron Configuration:

  • Positions of elements in the periodic table can be used to deduce the electron configurations of elements.
  • Example: Phosphorus, period 3
  • Period 3 means that n = 3 for the valence sub-levels
  • Group 15 means that it has 5 valence electrons.
  • [Ne] 3s23p3
  • 2+3 = 5 valence electrons
  • Period 4:  Take 3d sublevel into account:
  • Fill after 4s and before 4p
  • Consider Br,  Group 17 Period 4
  •    [Ar] 4s2 3d10 4p5
  • 2+5 = 7 valence electrons
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