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LEARN PERIODIC CLASSIFICATION OF ELEMENTS
3 students

LEARN PERIODIC CLASSIFICATION OF ELEMENTS

DOBEREINER TRIADS , NEW LANDS OCTAVE , MENDELEEV’S AND LONG FORM OF PERIODIC TABLE.
Created byVinay Arya
Last updated 9/2019
English
English [Auto],

What you'll learn

  • Periodic Table
  • Classification of elements

Course content

1 section • 10 lectures • 1h 56m total length

  • 5.1. CONTENTS11:12

    Explore the contents of periodic classification of elements, from Newlands octave to the long-form periodic table, focusing on grouping by atomic number, periodic properties, and key families.

  • 5.2.CLASSIFICATION OF ELEMENTS9:34

    Classify elements by grouping similar properties to form the periodic table, study triads and atomic mass relations, and explore early schemes such as alkali metals, alkaline earth metals, and halogens.

  • 5.3.NEW LANDS LAW OF OCTAVE10:10

    Explore Newlands law of octave, organizing elements by increasing atomic mass and showing recurring properties every eight elements, with examples like hydrogen, lithium, sodium, and potassium, plus its limitations.

  • 5.4.MENDELEEV’S PERIODIC TABLE13:09

    Explore how Mendeleev arranged elements by increasing atomic mass into groups with similar properties, left gaps to predict undiscovered elements, and refined the periodic table as new elements emerged.

  • 5.5.DRAWBACKS OF MENDELEEV'S PERIODIC TABLE14:02

    Explore the drawbacks of Mendeleev's periodic table, including hydrogen's uncertain position, isotopes, and misplacements of similar elements, and see how atomic number reshapes modern classification.

  • 5.6.LONG FORM OF PERIODIC TABLE17:31

    Discover the long form of the periodic table, organized by atomic number to reveal groups, periods, and the role of electronic configuration in element properties.

  • 5.7.ALKALI METALS8:31

    explain how alkali metals form the first group in the periodic table, with a single outermost electron in the s-block and trends in atomic radius down the group.

  • 5.8. OXYGEN FAMILY8:26

    Study the oxygen family in group 16 of the long-form periodic table, where elements form oxides with oxygen. Learn their electronic configurations and valence electrons to explain their chemical behavior.

  • 5.9. PERIODICITY IN PROPERTIES11:54

    Explore periodic trends in properties across groups and periods, linking electronic configuration and valence electrons to atomic size, oxidation states, and covalent radii.

  • 5.10. CATIONIC RADIUS12:14

    Explore cationic radius and other atomic radii within the periodic classification of elements, and learn how radii change across groups and periods with ionization energy and electron affinity.

  • Innovation

Requirements

  • Basics about Elements

Description

Before the beginning of the eighteenth century when there were only 30 elements known, it was easier to study and remember their properties. In later years when number of elements discovered were increased then it become difficult to study them. So scientist felt the need of simple method to facilitate the study of the properties of various elements and their compounds. After numerous attempts they got success and elements were arranged in such manner that similar elements were grouped together different elements were separated. This arrangement of elements is known as classification of elements which led to the formation of periodic table. This arrangement of elements is known as classification of elements which led to the formation of periodic table.

Periodic table may be defined as the arrangement of all the known elements according to their properties in such way that the elements of similar properties are grouped together in a tabular form.

Earlier attempts of classification of elements (development of periodic table) : Earlier attempts to classify the elements resulted in grouping as metals and non-metals. Later on they were classified on the basis of their atomic masses.

DOBEREINER TRIADS RULE :

In 1817, Johann walfgang dobereiner. A German chemist, arranged the elements is group of three elements and in a manner that the atomic mass of middle element was roughly the average of the atomic masses of the other two elements of the triad.

Example : Element : Lithium, Sodium and Potassium.

Who this course is for:

  • Beginners in chemistry
  • High school students
  • Research Scholars

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