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Periodic Table & Periodicity formulas

Master Periodic Table & Periodicity through 16 JEE Advanced-level formulas, systematically structured with every variable spelled out. Revise concept-wise, identify the areas where you need improvement, and focus your preparation with greater precision.

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Periodic Table & Periodicity, every formula

16 formulas, typeset and free. Print it, or keep it open beside your practice.

Modern periodic law
$properties are periodic functions of atomic number$
Q1MCQPeriodic law
The modern periodic law relates properties to:
- A
  atomic number
- B
  atomic mass
- C
  density
- D
  valency only
Atomic radius trend (period)
$decreases left \to right$
Q1MCQAtomic radius period
Across a period (left to right), atomic radius:
- A
  decreases
- B
  increases
- C
  stays constant
- D
  doubles
Atomic radius trend (group)
$increases top \to bottom$
Q1MCQAtomic radius group
Down a group, atomic radius:
- A
  increases
- B
  decreases
- C
  stays constant
- D
  halves
Ionization energy trend
$increases across a period, decreases down a group$
Q1MCQIE trend
Ionization energy generally:
- A
  increases across a period
- B
  decreases across a period
- C
  increases down a group
- D
  is constant
Electron affinity
$energy released on gaining an electron$
Q1MCQElectron affinity
Electron affinity is the energy change on:
- A
  gaining an electron
- B
  losing an electron
- C
  gaining a proton
- D
  forming a bond
Electronegativity (Pauling)
$tendency to attract shared electrons$
Q1MCQElectronegativity
Electronegativity is the tendency of an atom to:
- A
  attract shared electrons
- B
  lose electrons
- C
  gain protons
- D
  emit radiation
Effective nuclear charge
$Z_{e f f} = Z - σ$
Q1MCQZeff
The effective nuclear charge is:
- A
  $Z-\sigma$
- B
  $Z+\sigma$
- C
  $Z\sigma$
- D
  $\dfrac{Z}{\sigma}$
Number of periods and groups
$7 periods, 18 groups$
Metallic character trend
$decreases across, increases down$
Q1MCQMetallic character
Metallic character down a group:
- A
  increases
- B
  decreases
- C
  is constant
- D
  vanishes
Cation vs atom size
$cation < parent atom$
Q1MCQCation size
A cation compared with its parent atom is:
- A
  smaller
- B
  larger
- C
  the same
- D
  double
Anion vs atom size
$anion > parent atom$
Q1MCQAnion size
An anion compared with its parent atom is:
- A
  larger
- B
  smaller
- C
  the same
- D
  half
Isoelectronic size
$more protons \Rightarrow smaller radius$
Q1MCQIsoelectronic
Among isoelectronic species, the one with more protons is:
- A
  smaller
- B
  larger
- C
  the same size
- D
  unstable
IE₂>IE₁
$successive ionization energies increase$
Q1MCQSuccessive IE
Successive ionization energies of an atom:
- A
  increase ($IE_2>IE_1$)
- B
  decrease
- C
  are equal
- D
  are zero
Diagonal relationship
$Li-Mg, Be-Al, B-Si show similar properties$
Q1MCQDiagonal relationship
Which pair shows a diagonal relationship?
- A
  Li–Mg
- B
  Na–K
- C
  O–S
- D
  F–Cl
Lanthanide contraction
$steady decrease in size across the lanthanides$
Q1MCQLanthanide contraction
The lanthanide contraction is the steady decrease in size due to:
- A
  poor shielding by $4f$ electrons
- B
  increasing shells
- C
  decreasing charge
- D
  electron gain
Blocks
$s, p, d, f blocks by last-filled orbital$
Q1MCQBlocks
An element with its last electron in a $d$-orbital belongs to the:
- A
  $d$-block
- B
  $s$-block
- C
  $p$-block
- D
  $f$-block

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Periodic Table & Periodicity formulas

Periodic Table & Periodicity, every formula

Modern periodic law

Atomic radius trend (period)

Atomic radius trend (group)

Ionization energy trend

Electron affinity

Electronegativity (Pauling)

Effective nuclear charge

Number of periods and groups

Metallic character trend

Cation vs atom size

Anion vs atom size

Isoelectronic size

IE₂>IE₁

Diagonal relationship

Lanthanide contraction

Blocks

More JEE Advanced Chemistry formula sheets

Other ways to revise this chapter

Preparing students for India’s top institutes

Join QuestPix, Today!