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Index: Periodic Classification of Elements | Physical Science for High School - Grade 9 PDF Download

(a) Early Attempts at the Classification of Elements

(b) Mendeleev’s Periodic Table

(c) The Modern Periodic Table

(d) Previous Year Questions

(e) NCERT Textbook & Solutions

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Index: Periodic Classification of Elements
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(f) Overview & Mindmap

(g) Lakhmir Singh & Manjit Kaur

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(h) Full Chapter Practice Tests and Docs

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FAQs on Index: Periodic Classification of Elements - Physical Science for High School - Grade 9

1. What is the periodic classification of elements?
Ans. The periodic classification of elements is a systematic arrangement of elements based on their atomic number, electronic configuration, and chemical properties. It helps in understanding the trends and patterns in the properties of elements.
2. How are elements classified in the periodic table?
Ans. Elements are classified in the periodic table based on their atomic number, which represents the number of protons in the nucleus of an atom. Elements with similar chemical properties are grouped into the same column known as a group or family.
3. What are the periods and groups in the periodic table?
Ans. Periods in the periodic table are the horizontal rows, numbered from 1 to 7. Groups are the vertical columns, numbered from 1 to 18. Elements in the same period have the same number of electron shells, while elements in the same group have similar valence electron configurations and exhibit similar chemical properties.
4. How does the periodic table help in predicting properties of elements?
Ans. The periodic table helps in predicting properties of elements by showing the trends and patterns in their atomic size, ionization energy, electronegativity, and chemical reactivity. Elements in the same group tend to have similar properties, while elements in the same period show gradual changes in properties.
5. Why is the periodic table considered a significant tool in chemistry?
Ans. The periodic table is considered a significant tool in chemistry because it provides a structured and organized way of representing the elements. It helps in understanding the relationships between elements, predicting their properties, and identifying trends in the periodicity of various properties. It is also essential for studying chemical reactions and designing experiments.
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