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Atomic weight is the weighted average mass of an element's naturally occurring isotopes. Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. The number of protons defines an element and never changes, while the number of neutrons can vary between isotopes of an element. Isotopes are represented by a symbol noting the number of protons and neutrons.
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Cite the difference between atomic mass and atomic weight- i need it.docx
Cite the difference between atomic mass and atomic weight.
i need it as soon as possple
Solution
Atomic mass :
The atomic mass (ma) is the mass of an atom at rest, most often expressed in unified atomic mass units. The atomic mass is sometimes incorrectly used as a synonym of relative atomic mass, average atomic mass and atomic weight; however, these differ subtly from the atomic mass. The atomic mass is defined as the mass of an atom, which can only be one isotope at a time and is not an abundance-weighted average. The actual numerical difference is usually very small such that it does not affect most bulk calculations but such an error can be critical when considering individual atoms.
Atomic weight :
Definition: The average mass of the atoms of an element. This is a weighted average of the naturally-occurring isotopes.
-Ratio of the average mass of a chemical element\'s atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. An isotope is one of two or more species of atoms of the same chemical element that have different atomic numbers (protons + neutrons) and thus different atomic masses.
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3) Protons are positively charged, neutrons have no charge, and electrons are negatively charged. The number of protons determines the element.
Atomic structure
Protons and neutrons make up the tiny, dense nucleus at the center of the atom, accounting for nearly all of its mass. Electrons orbit rapidly around the nucleus and take up nearly the entire volume of the atom. The number of protons determines the identity of an element, while neutrons distinguish between isotopes of that element. Chemical properties depend on the number of protons and electrons. The mass and radioactive properties depend on the total number of protons and neutrons in the nucleus.
Similar to Hbsc 4303 bahan (20)
Cite the difference between atomic mass and atomic weight- i need it.docx
Cite the difference between atomic mass and atomic weight- i need it.docx
Hbsc 4303 bahan
- 1. The Modern Concept of Atomic Structure Comparing the Parts of an Atom
- 2. ISOTOPES
- 3. Atomic Weight Atomic Weight - average mass of the naturally occurring isotopes of an element . The Atomic Weight of an element is the weighted average of the atomic masses of the different isotopes of that element. Atomic Weight is also known as the Average Atomic Mass Units for Atomic Weight are amu = atomic mass units
- 4. Isotopes Isotopes are atoms with the same number of protons but different numbers of neutrons.
- 5. Isotopes The number of protons for a given atom never changes. The number of neutrons can change. Two atoms with different numbers of neutrons are called isotopes
- 6. Isotopes Have the same atomic number (number of protons) Have different atomic mass numbers (number of protons + neutrons)
- 7. Isotopes A particular isotope is represented by the symbol.