Evolution of Periodic Classification
The classification of elements helps in studying them more systematically. Early attempts include Dobereiner's Triads, Newlands' Law of Octaves, and Mendeleev's Periodic Table.
Major Topics for HSLC 2027
- Mendeleev's Periodic Table: Achievements and limitations of Mendeleev's work.
- Modern Periodic Law: Elements are arranged in the order of their increasing atomic numbers.
- Modern Periodic Table: Groups, periods, and the position of elements.
- Trends in Properties: Variations in Valency, Atomic size, Metallic and non-metallic character across periods and groups.
Chapter-wise Question Answer
Study these Class 10 Science solutions for your board exams:
Q1: Who gave the Modern Periodic Law?
Ans: Henry Moseley.
Q2: How does the atomic size change down a group?
Ans: The atomic size increases down a group due to the addition of new electron shells.
HSLC Science MCQ & Important Questions
Focus on the trends in the modern periodic table and the position of noble gases for the 2027 HSLC exams.
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