Asked in ChemistryParticle Physics
Chemistry
Particle Physics
Do protons electrons or neutrons have more mass?
Answer

Wiki User
January 22, 2010 7:57PM
Neutrons.
Neutrons and Protons have approximately the same mass, and
electrons have comparatively almost no mass!
Protons do have mass, but not very much. A proton's mass is 1.66 x
10-24g, and it takes 6.02 x 1023 of them to make a gram (with
thanks to the Italian chemist Avogadro, whom that number is named
for).
Related Questions
Asked in Elements and Compounds
The element sodium has a larger mass than the element neon. How is this possible when neon has so many more valence electrons?

sodium has more protons and neutrons. electrons have practically
no mass, valence electrons are just outer orbital electrons. sodium
has 11 protons, 11 electrons, and 12 neutrons. Mass is 23. neon has
10 protons, 10 electrons, and 10 neutrons. Mass is just 20. The
neon atom has 10 protons and 10 neutrons for a mass number of 20.
The sodium atom has 11 protons and 12 neutrons for a mass number of
23. The number of valence electrons has no bearing on mass number
or atomic weight.
Asked in Chemistry, Elements and Compounds, Atoms and Atomic Structure
Why the Mass number is sum of neutrons and protons only?

The neutrons and protons are in the nucleus which determines the
element/isotope. The electrons however define the net charge (ie.
positive if there are less electrons then protons and negative if
more) and it can be changed more easily, than changing the amount
of neutrons . Another reason is that electrons have a tiny mass
compared to the protons and neutrons and it wouldn't change the
mass number by all that much.
Asked in Science, Chemistry
Does an atom has a mass?
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How are the nucleus and atomic mass related?

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What is the atom mass of an atom with 23 protons 24 neutrons and 25 electrons?

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