posted by .

what is an atomic mass unit? what are the approximate masses of the subtomic particles, expressed in atomic mass units?

  • chemistry -

    1 amu is equal to one-twelfth of the mass of a carbon-12 atom, including its electrons. It is slightly less than the mass of a free neutron or a free proton.

    A free electron has a mass of 1/1823 amu.

    The mass of an atom is always less than the sum of the masses of its separate neutrons, protons and electrons, because the negative binding energy of the atom (which holds it together) reduces the mass.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    What instrument is used to determine the mass and relative ambuandaces of small atomic particles?
  2. Chemistry (check)

    is the following sentence true or false? To determine the number of representative particles in a compound, you count the molecules by viewing them under a microscope.__true______ Most molecules are too small to see with an ordinary
  3. science

    what is an atomic mass unit? What are the approximate masses of the subatomic particles, expressed in atomic mass units?
  4. Final Exam- Honors Physical Science

    how can you determine the number of protons, electrons,neutrons, atomic number, and the atomic mass of an element using the periodic table?
  5. physical science

    The exact question how are the following terms related - subatomic particels and atomic mass unit. The heading on the page is review and reinforcement structure of an atom - the three main subtomic particles are the proton, the nuetron …
  6. Chemistry

    The standard atom for the atomic masses of all the elements is the atom of carbon which has 6 protons and 6 neutrons (12C) and is assigned the atomic mass of exactly 12. Under this standard, the atomic mass of iron, atomic number 26, …
  7. chemistry

    what are the appropriate masses of the subatomic particles expressed in atomic mass unit
  8. Physics

    Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.6 million electron volts, a charge of +2e, and a mass of about four AMU (one Atomic Mass Unit …
  9. Chemistry

    12) Naturally occurring argon is composed of 0.3365% of 36Ar (atomic mass, 35.9675 u), 0.0632% of 38Ar (atomic mass, 37.9627 u), and 99.6003% of 40Ar (atomic mass, 39.9624 u). Use these data to calculate the average atomic mass of …
  10. Chemistry

    How is it possible that the atomic number increases in order, yet the atomic masses do not?

More Similar Questions