Wednesday, 13 February 2013

1.11 understand the terms atomic number, mass number, isotopes and relative atomic mass (Ar)

Atomic number: number of protons (the same as number of electrons.)

Mass number: number of protons + neutrons.

Isotopes: Atoms of an element with different numbers of neutrons.

Relative atomic mass (Ar): the mass of one atom of an element.
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12 comments:

  1. Fritz John Marajas5 February 2015 at 18:58

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  2. Fritz John Marajas5 February 2015 at 19:24

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  3. Unknown26 May 2015 at 03:33

    (the same number of neutrons)/ not electrons

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  4. Unknown26 May 2015 at 03:34

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  5. Unknown26 May 2015 at 03:35

    (the same number of neutrons)/ not electrons

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  6. Unknown2 January 2016 at 11:10

    hi in the relative atomic mass one, do you have to mention something about in relation to carbon 12?

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  7. Unknown9 January 2016 at 09:08

    the way we learnt it was: the weighted mean mass of an atom of an element, relative to one twelfth of the mass of an atom of carbon-12. That got me all the marks in the exams

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  8. Unknown12 January 2016 at 13:24

    Ram is the average weighted mass between all the isotopes of an element

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  9. Unknown11 May 2016 at 09:17

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  10. Bibblemeizzy29 November 2016 at 15:50

    Mass number is the number of protons and neutrons in an atom, and it tells us about the mass of the atom in amu, or atomic mass units. Atomic mass is the average mass of all the isotopes of a certain type. It is a weighted average that takes into account the abundances of all of the different isotopes.

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  11. Edward13 April 2017 at 12:39

    AN ISOTOPE IS AN ATOM WITH THE SAME NUMBER OF PROTONS OR DIFFERENT NUMBER OF NEUTRONS

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  12. Unknown6 June 2018 at 05:44

    Very good for quick revision

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