Class 9 Exam > Class 9 Questions > Mass number of element is –a)Number of ...
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Mass number of element is –
- a)Number of protons in its nucleus
- b)Number of electrons and protons in the atom
- c)Number of neutrons and protons in the nucleus
- d)Number of neutrons in the nucleus
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Mass number of element is –a)Number of protons in its nucleusb)N...
The mass number is sum. Of protons and neutrons in the nucleus because mass of electrons is so much less that it is almost neglectable. So when we calculate mass we only take protons and neutrons.
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Mass number of element is –a)Number of protons in its nucleusb)N...
Understanding Mass Number
The mass number of an element is a crucial concept in chemistry and nuclear physics, representing the total number of nucleons in an atom’s nucleus. Here’s a detailed explanation of why option 'C' is correct.
Definition of Mass Number
- The mass number is defined as the sum of protons and neutrons in the nucleus of an atom.
- Protons are positively charged particles, while neutrons are neutral particles.
Importance of Protons and Neutrons
- Protons determine the element's identity and its position on the periodic table.
- Neutrons contribute to the atomic mass and influence the stability of the nucleus.
Why Option C is Correct
- Option 'C' states that the mass number is the "Number of neutrons and protons in the nucleus."
- This accurately reflects the definition of mass number, as it includes both types of nucleons.
Why Other Options are Incorrect
- Option A: "Number of protons in its nucleus" – This only accounts for protons and ignores neutrons.
- Option B: "Number of electrons and protons in the atom" – This includes electrons, which do not contribute to mass number since they are negligible in mass.
- Option D: "Number of neutrons in the nucleus" – This ignores protons, thus failing to provide a complete picture.
Conclusion
Understanding the mass number is essential for comprehending atomic structure and stability. Option 'C' is the only choice that accurately captures the essence of mass number by including both protons and neutrons.
The mass number of an element is a crucial concept in chemistry and nuclear physics, representing the total number of nucleons in an atom’s nucleus. Here’s a detailed explanation of why option 'C' is correct.
Definition of Mass Number
- The mass number is defined as the sum of protons and neutrons in the nucleus of an atom.
- Protons are positively charged particles, while neutrons are neutral particles.
Importance of Protons and Neutrons
- Protons determine the element's identity and its position on the periodic table.
- Neutrons contribute to the atomic mass and influence the stability of the nucleus.
Why Option C is Correct
- Option 'C' states that the mass number is the "Number of neutrons and protons in the nucleus."
- This accurately reflects the definition of mass number, as it includes both types of nucleons.
Why Other Options are Incorrect
- Option A: "Number of protons in its nucleus" – This only accounts for protons and ignores neutrons.
- Option B: "Number of electrons and protons in the atom" – This includes electrons, which do not contribute to mass number since they are negligible in mass.
- Option D: "Number of neutrons in the nucleus" – This ignores protons, thus failing to provide a complete picture.
Conclusion
Understanding the mass number is essential for comprehending atomic structure and stability. Option 'C' is the only choice that accurately captures the essence of mass number by including both protons and neutrons.
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Mass number of element is –a)Number of protons in its nucleusb)Number of electrons and protons in the atomc)Number of neutrons and protons in the nucleusd)Number of neutrons in the nucleusCorrect answer is option 'C'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Mass number of element is –a)Number of protons in its nucleusb)Number of electrons and protons in the atomc)Number of neutrons and protons in the nucleusd)Number of neutrons in the nucleusCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Mass number of element is –a)Number of protons in its nucleusb)Number of electrons and protons in the atomc)Number of neutrons and protons in the nucleusd)Number of neutrons in the nucleusCorrect answer is option 'C'. Can you explain this answer?.
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