Toppers Study Toppers Study Toppers StudyGet complete NCERT Solutions for 9 Science 4. Structure of The Atom with detailed explanations. Easy-to-understand answers to help students study effectively and score better.
Get complete NCERT Solutions for 9 Science 4. Structure of The Atom with detailed explanations. Easy-to-understand answers to help students study effectively and score better.
Preparing for exams becomes easier with Additional -Questions 2. Whether you are studying for board exams or mid-term exams, 9 Science Chapter 4. Structure of The Atom solutions provide quick revising points, well-structured answers, and additional practice material to help you score better.
ncert_solutionsQ – Write the results of Rutherford’s particle scattering experiment.
A – The following observations were made: Most of the fast moving particles passed straight through the gold foil.
5. Compare all the proposed models of an atom given in this
chapter.
6. Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Q – Describe Thomson’s model of the atom.
A – Thomson proposed that:
Q – Define valency by taking examples of silicon and oxygen.
A – The electrons present in the outermost shell of an atom are known as the valence electrons. This number of valence electrons is called valency.
Example of silicon and oxygen
Number of electrons in silicon = 14
Electronic configuration = 2, 8, 4
The number of valence electrons = 4
Hence valency = 4
Example of oxygen
Number of electrons in oxygen = 8
Electronic configuration = 2, 6
The number of valence electrons = 8 – 6 = 2
Hence valency = 2
Q – Define atomic number.
A – The number of protons presence in nucleus of an atom is known as atomic number.
Q – Define atomic mass.
A – The sum of number of protons and neutrons presence in nucleus of an atom is known as atomic mass.
Q – Define isotopes.
A – The atoms of an element are called isotopes of that element which has equal atomic number but different atomic mass.
Q – Define isobar.
A – The atoms of an element are called isobar of that element which
Q – Differentiate between isotopes and isobars.
A -
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isotopes |
isobars |
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Q – Write three applications of isotopes.
A – Three applications of isotopes.
Additional -Questions 2 are created by experts to give step-by-step explanations. Around 60–70% of exam questions are based on NCERT concepts. Our 9 Science Chapter 4. Structure of The Atom solutions help you understand the core concepts and practice effectively.
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To boost your preparation, we also provide additional important questions with answers. These are prepared from previous year board papers, sample papers, and important concepts of Chapter 4. Structure of The Atom. Practicing these ensures you are well-prepared for both board and mid-term exams.
Our Additional -Questions 2 are useful for both board exams and mid-term exams. For 9 Science, we provide notes, exercises, and important Q&A so that you can revise smartly and write perfect answers in exams.
In short, Additional -Questions 2 for 9 Science Chapter 4. Structure of The Atom are a complete study package. With quick revising points, NCERT exercises, and additional important questions, you can prepare effectively for exams. Make these solutions your study companion and excel in your academic journey.
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