Class 12 Exam > Class 12 Questions > What percentage of the mass of an atom is con... Start Learning for Free
What percentage of the mass of an atom is concentrated in the nucleus?
- a)79.9%
- b)99.9%
- c)66.9%
- d)50.9%
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
What percentage of the mass of an atom is concentrated in the nucleus?...
More than 99.99% of the mass of any atom is concentrated in its nucleus. If the mass of protons and neutrons (which are in the nucleus of every atom) is approximately one atomic mass unit, then the relative mass of an electron is 0.0005 atomic mass units.
Most Upvoted Answer
What percentage of the mass of an atom is concentrated in the nucleus?...
More than 99.99% of the mass of any atom is concentrated in its nucleus. If the mass of protons and neutrons (which are in the nucleus of every atom) is approximately one (1) atomic mass unit, then the relative mass of an electron is 0.0005 atomic mass units.
Community Answer
What percentage of the mass of an atom is concentrated in the nucleus?...
Percentage of mass in the nucleus of an atom
- Explanation:
The correct answer is option B, which is 99.9%. This means that almost all of the mass of an atom is concentrated in the nucleus.
- Reasoning:
The nucleus of an atom is where most of its mass is concentrated because it contains the protons and neutrons, which are much heavier than the electrons that orbit the nucleus. Protons and neutrons have approximately the same mass, around 1 atomic mass unit each, while electrons have a much smaller mass, about 0.0005 atomic mass units.
- Calculation:
If we consider a typical atom like carbon, which has 6 protons and 6 neutrons in its nucleus, the total mass of the nucleus would be about 12 atomic mass units (6 protons x 1 amu + 6 neutrons x 1 amu). The total mass of the atom (including electrons) is about 12.01 atomic mass units. Therefore, the percentage of mass in the nucleus would be (12 / 12.01) x 100 = 99.9%.
- Conclusion:
In conclusion, the vast majority of an atom's mass is concentrated in its nucleus due to the presence of protons and neutrons, which are much heavier than electrons.
 | Explore Courses for Class 12 exam |  |
Top Courses for Class 12View all
Top Courses for Class 12
Question Description
What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? for Class 12 2026 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer?.
What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? for Class 12 2026 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer?.
Solutions for What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer?, a detailed solution for What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice What percentage of the mass of an atom is concentrated in the nucleus?a)79.9%b)99.9%c)66.9%d)50.9%Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Class 12 tests.
| Explore Courses for Class 12 exam | |
Top Courses for Class 12
Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
