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Chemistry · Periodic Table

Periodic Trends Explorer - Atomic Radius, Electronegativity

Interactive periodic table heat-map. Explore atomic radius, electronegativity, ionization energy trends across periods and groups.

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📊 Periodic Trends Explorer - Atomic Radius, Electronegativity

Periodic Table
What's happening? Atomic radius decreases across a period, increases down a group. Electronegativity and ionization energy do the opposite. The heat-map shows the trend visually.
Why this matters for JEE

Periodic trends: 3-5 questions every year.

JEE tests atomic radius, IE, EN, EA trends and exceptions.

Key formulas

Periodic Trends Formulas

Radius

decreases across period, increases down group

Z_eff pulls electrons closer

IE

IE proportional to Z_eff/r^2

Higher Z_eff, smaller r = higher IE

EN

EN proportional to Z_eff/r

Pauling scale. F = 4.0 (highest)

EA

EA proportional to 1/r

Cl > F exception

Step-by-step problem solving

How to solve chemistry problems in JEE

  1. Identify element position
  2. Determine which trend
  3. Apply general direction
  4. Check exceptions
Common JEE mistakes

What students get wrong

Memorize without understanding

Understand Z_eff and shielding

Ignore exceptions

O IE < N (pair repulsion). F EA < Cl

Isoelectronic confusion

Smaller ion = higher IE, EN

Wrong diagonal

Li-Mg, Be-Al, B-Si only

FAQs

Periodic Trends Questions

Radius decreases across period?

Z_eff increases, pulls electrons closer

F EA < Cl?

F small, strong electron repulsion

Key exceptions?

N IE > O, Cu: [Ar]3d10 4s1, B IE < Be

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n dominates size, Z_eff dominates IE/EN in period

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