Classification of elements in periodic table (PART 1)

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Chemistry

HIGH_SCHOOL

Last updated 5:32 PM on 7/15/26
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23 Terms

1
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1) JW Dobereiner - TRIADS

-Arranged in increasing order of ATOMIC MASS

-Atomic mass = Mean of 2 other triad elements

Class 10 Periodic Classification of Elements

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2) Newland’s Octaves- MUSICAL NOTES

  • Arranged in order of ATOMIC MASS

  • Like International musical notes

  • Property of every 8th element similar to 1st element

Newlands' Law of Octaves - Study Page

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Mendeleev’s periodic law

“The physical and chemical properties of elements are periodic function of ATOMIC MASS

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Merits of Mendeleev classification

  • First comprehensive classification

  • 63 elements in 12 grps and 9 periods

  • corrected atomic masses

  • Periodicity (Same property of elements repeated at regular interval)

  • prediction of properties of undiscovered elements

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DRAWBACKS of Mendeleev’s classification

  • No explanation for periodicity

  • Dissimilar elements grouped together

  • no space for H, noble gas etc

  • no distinction between metal, non-metal, metalloids

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Modern Periodic Law-Moseley

The physical and chemical properties of elements are periodic function of their ATOMIC NUMBER'“

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Isoelectronic?

Atoms and ions with same electrons

Periodic Trends in Atomic and Ionic Properties | Inorganic Chemistry I Class Notes | Fiveable

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IUPAC for z> 100

0-nil

1-un

2-bi

3-tri

4-quad

5-pent

6-hex

7-sept

8-oct

9-enn

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S-block elements

Block Classification of Periodic Table Elements - Periods and Groups

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s-block outer e- configuration?

ns^1-2

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s-block characteristics

ERIC

  • Highly ELECTROPOSITIVE

  • strong REDUCING AGENTS

  • readily form IONIC BONDS

  • CHARACTERISTIC FLAME

    Which elements are best detected in flame photometry Group 1 & 2 metals (s- block) because they emit strong, clear colors. “Alkali metals: The kings of glowing!”

crimson red, golden yellow, pale violet, reddish violet, sky blue, brick red, crimson red, apple green

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p-block configuration?

ns2np1−6

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Characteristics of p-block elements

CAE

  • Highly ELECTRONEGATIVE

  • Show CATENATION

  • ALLOTROPY

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d-block configuration?

(n-1)d1-10ns1-2

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d-block properties

  • Variable oxidation

  • Catalytic

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f-block configuration?

(n-2)f(1-14)(n-1)d(0-1)ns²

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f-block characteristics

  • Lanthanoids and Actinoids

  • Lanthanoids- all NON RADIOACTIVE (except Pm)

  • Actinoids- All radioactive

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identification of period number?

Highest principal quantum number (n)

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Identifying Block?

subshell in which last e- enters

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Identifying Group? (for s)

grp no. = No. of electrons in s subshell

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Identifying Group? (for p)

grp no. = 10 + no. of electrons in last s + last p

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Identifying Group? (for d)

grp no. = no of e- in last s + last d

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postion of Z= 36?

  • [Ar] 3d10 4s2 4p6

  • d-block

  • grp = 10+2 = 12

  • period = 4