• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar
  • Skip to footer
  • RBSE Model Papers
    • RBSE Class 12th Board Model Papers 2022
    • RBSE Class 10th Board Model Papers 2022
    • RBSE Class 8th Board Model Papers 2022
    • RBSE Class 5th Board Model Papers 2022
  • RBSE Books
  • RBSE Solutions for Class 10
    • RBSE Solutions for Class 10 Maths
    • RBSE Solutions for Class 10 Science
    • RBSE Solutions for Class 10 Social Science
    • RBSE Solutions for Class 10 English First Flight & Footprints without Feet
    • RBSE Solutions for Class 10 Hindi
    • RBSE Solutions for Class 10 Sanskrit
    • RBSE Solutions for Class 10 Rajasthan Adhyayan
    • RBSE Solutions for Class 10 Physical Education
  • RBSE Solutions for Class 9
    • RBSE Solutions for Class 9 Maths
    • RBSE Solutions for Class 9 Science
    • RBSE Solutions for Class 9 Social Science
    • RBSE Solutions for Class 9 English
    • RBSE Solutions for Class 9 Hindi
    • RBSE Solutions for Class 9 Sanskrit
    • RBSE Solutions for Class 9 Rajasthan Adhyayan
    • RBSE Solutions for Class 9 Physical Education
    • RBSE Solutions for Class 9 Information Technology
  • RBSE Solutions for Class 8
    • RBSE Solutions for Class 8 Maths
    • RBSE Solutions for Class 8 Science
    • RBSE Solutions for Class 8 Social Science
    • RBSE Solutions for Class 8 English
    • RBSE Solutions for Class 8 Hindi
    • RBSE Solutions for Class 8 Sanskrit
    • RBSE Solutions

RBSE Solutions

Rajasthan Board Textbook Solutions for Class 5, 6, 7, 8, 9, 10, 11 and 12

  • RBSE Solutions for Class 7
    • RBSE Solutions for Class 7 Maths
    • RBSE Solutions for Class 7 Science
    • RBSE Solutions for Class 7 Social Science
    • RBSE Solutions for Class 7 English
    • RBSE Solutions for Class 7 Hindi
    • RBSE Solutions for Class 7 Sanskrit
  • RBSE Solutions for Class 6
    • RBSE Solutions for Class 6 Maths
    • RBSE Solutions for Class 6 Science
    • RBSE Solutions for Class 6 Social Science
    • RBSE Solutions for Class 6 English
    • RBSE Solutions for Class 6 Hindi
    • RBSE Solutions for Class 6 Sanskrit
  • RBSE Solutions for Class 5
    • RBSE Solutions for Class 5 Maths
    • RBSE Solutions for Class 5 Environmental Studies
    • RBSE Solutions for Class 5 English
    • RBSE Solutions for Class 5 Hindi
  • RBSE Solutions Class 12
    • RBSE Solutions for Class 12 Maths
    • RBSE Solutions for Class 12 Physics
    • RBSE Solutions for Class 12 Chemistry
    • RBSE Solutions for Class 12 Biology
    • RBSE Solutions for Class 12 English
    • RBSE Solutions for Class 12 Hindi
    • RBSE Solutions for Class 12 Sanskrit
  • RBSE Class 11

RBSE Class 10 Science Notes Chapter 5 Periodic Classification of Elements

April 12, 2022 by Fazal Leave a Comment

These comprehensive RBSE Class 10 Science Notes Chapter 5 Periodic Classification of Elements will give a brief overview of all the concepts.

RBSE Class 10 Science Chapter 5 Notes Periodic Classification of Elements

→ In the Periodic Table, elements are classified on the basis of similarities in their properties.

→ Triads of Dobereiner-In 1817, Johann Wolfgang Dobereiner, a German chemist, tried to arrange the elements with similar properties into groups. He identified some groups having three elements each. So he called these groups “triads’. Dobereiner showed that when the three elements in a triad were written in the order of increasing atomic masses; the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements. So the property of middle element is also in between other two elements. Example-Li, Na and K.

→ Newlands Law of Octaves-He arranged the elements in the increasing order of atomic masses and found that every eighth element had properties similar to that of first like music in which eighth note is similar to first note. This is called Newlands Law of Octaves.

RBSE Class 10 Science Notes Chapter 5 Periodic Classification of Elements

→ With the discovery of noble gases, the Law of Octaves become irrelevant.

→ According to Mendeleev the elements were arranged on the basis of their fundamental property. The atomic mass, and also on the similarity of chemical properties.

→ Mendeleev’s Periodic Law-The properties of elements are the periodic function of their atomic masses.

→ Mendeleev’s arranged the elements in the increasing order of atomic masses and found the similarities in the properties of elements of same group.

→ Mendeleev even predicted the existence of some yet to be discovered elements on the basis of gaps in his Periodic Table.

→ When Mendeleev started his work, 63 elements were known. He studied the relationship between the atomic masses of the elements and their physical and chemical properties.

→ Among chemical properties, Mendeleev concentrated on the compounds formed by elements with oxygen and hydrogen.

→ Mendeleev’s Periodic Table contains vertical columns called ‘groups’ and horizontal rows called ‘periods’.

→ No fixed position can be given to hydrogen in the Mendeleev’s Periodic Table and there is no place for isotopes.

→ Moseley classified the elements on the basis of atomic numbers.

→ Anomalies in arrangement of elements based on increasing atomic mass could be removed when the elements were arranged in order of increasing atomic number, in modern Periodic Table. Because the similarities in the properties of elements can easily be determined on the basis of atomic number.

RBSE Class 10 Science Notes Chapter 5 Periodic Classification of Elements

→ Modern Periodic Law – The properties of elements are the Periodic Function of their atomic numbers.

→ Modern Periodic Table have 18 groups (vertical columns) and 7 Periods (horizontal rows).

→ The outer most electronic configuration of all the elements of every group is same. So properties of these elements are also same because chemical properties of elements depends on electronic configuration.

→ The properties of elements show periodicity in groups and periods.

→ The number of valence shell electrons increases by one unit, as the atomic number increases by one unit on moving from left to right in a period.

→ The maximum number of electrons that can be accommodated in a shell (K, L, M) depends on the formula 2n2 where ‘n’ is the number of the given shell from the nucleus.

→ The distance between the centre of the nucleus and the last electron of an isolated atom is called atomic radius or atomic size.

→ In the Periodic Table the atomic size increases in a group in moving top to bottom because new shells are being added as we go down the group. This increases the distance between the last electrons and the nucleus so that the atomic size increases in spite of the increase in nuclear charge. The atomic radius decreases in moving from left to right along a period. Because an increase in nuclear charge (Protons) nuclear attraction force also increases so this reduce the size of the atom.

RBSE Class 10 Science Notes Chapter 5 Periodic Classification of Elements

→ In the Periodic table, the metals are towards the left-hand side while the non-metals are found on the right-hand side.

→ In the Modern Periodic Table, a zig-zag line separates metals from non-metals. The borderline elements are called metalloids or semi-metals.

→ Metallic character of elements decreases in a period and increases in a group.

→ Metalloids (sub metals) have the properties of metals and non metals both.

→ Metal oxides are generally basic and non metal oxides are acidic.

→ Metals are electropositive means they have the tendency to lose the electrons.

RBSE Class 10 Science Notes Chapter 5 Periodic Classification of Elements

→ In a period effective nuclear charge on valance shell electrons increases so electron lossing tendency of elements decreases.

→ Effective nuclear charge decreases in a group on moving top to bottom. So electron lossing tendency of elements decreases.

→ Non metals are electronegative means they have the tendency to accept the electrons.

Share this:

  • Click to share on WhatsApp (Opens in new window)
  • Click to share on Twitter (Opens in new window)
  • Click to share on Facebook (Opens in new window)

Related

Filed Under: RBSE Notes

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Recent Posts

  • RBSE Solutions for Class 6 Maths Chapter 6 Decimal Numbers Additional Questions
  • RBSE Solutions for Class 11 Psychology in Hindi Medium & English Medium
  • RBSE Solutions for Class 11 Geography in Hindi Medium & English Medium
  • RBSE Solutions for Class 3 Hindi
  • RBSE Solutions for Class 3 English Let’s Learn English
  • RBSE Solutions for Class 3 EVS पर्यावरण अध्ययन अपना परिवेश in Hindi Medium & English Medium
  • RBSE Solutions for Class 3 Maths in Hindi Medium & English Medium
  • RBSE Solutions for Class 3 in Hindi Medium & English Medium
  • RBSE Solutions for Class 4 Hindi
  • RBSE Solutions for Class 4 English Let’s Learn English
  • RBSE Solutions for Class 4 EVS पर्यावरण अध्ययन अपना परिवेश in Hindi Medium & English Medium

Footer

RBSE Solutions for Class 12
RBSE Solutions for Class 11
RBSE Solutions for Class 10
RBSE Solutions for Class 9
RBSE Solutions for Class 8
RBSE Solutions for Class 7
RBSE Solutions for Class 6
RBSE Solutions for Class 5
RBSE Solutions for Class 12 Maths
RBSE Solutions for Class 11 Maths
RBSE Solutions for Class 10 Maths
RBSE Solutions for Class 9 Maths
RBSE Solutions for Class 8 Maths
RBSE Solutions for Class 7 Maths
RBSE Solutions for Class 6 Maths
RBSE Solutions for Class 5 Maths
RBSE Class 11 Political Science Notes
RBSE Class 11 Geography Notes
RBSE Class 11 History Notes

Copyright © 2023 RBSE Solutions