Isotopes & AvgMass
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| On the periodic table, the column to the far right is called the [...] gases. | On the periodic table, the column to the far right is called the noble gases.
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| Isotopes of the same element vary in the number of [...] they contain. | Isotopes of the same element vary in the number of neutrons they contain.
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| Some isotopes have unstable nuclei and radioactive; they are called [...]. | Some isotopes have unstable nuclei and radioactive; they are called radioisotopes.
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| The mass of an atom is measured in [...] mass units (amu). | The mass of an atom is measured in atomic mass units (amu).
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| *Technically*, an atomic mass unit is 1/12th the mass of an atom of [...]... for practical purposes, it's the mass of one proton or neutron. | *Technically*, an atomic mass unit is 1/12th the mass of an atom of carbon-12... for practical purposes, it's the mass of one proton or neutron.
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| Not all isotopes are found in the same [...] in nature. | Not all isotopes are found in the same abundance in nature.
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| The periodic table gives us the [...]mass of all the atoms of each element instead of giving us the individual mass and abundance of each known isotope. | The periodic table gives us the average mass of all the atoms of each element instead of giving us the individual mass and aboundance of each known isotope.
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| If you know the masses and abundances (as a percent) of each isotope of an element, the average atomic mass is the sum of the [...] of each isotope. | If you know the masses and abundances (as a percent) of each isotope of an element, the average atomic mass is the sum of the mass times the abundance of each isotope.
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| The isotopes of an atom have the same number of [...] but different numbers of [...]. | The isotopes of an atom have the same number of protons but different numbers of neutrons.
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| An [...] is a different form of the same atom of the element. | An isotope is a different form of the same atom of the element.
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| By definition, an atom of any element has a set number of [...]. | By definition, an atom of any element has a set number of protons.
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| Each isotope has a different atomic [...], and each occurs in nature in a different [...]. | Each isotope has a different atomic mass, and each occurs in nature in a different abundance.
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| *Technically*, an atomic mass unit is 1/12th the mass of an atom of carbon-12... for practical purposes, it's the mass of one [...] or [...]. | *Technically*, an atomic mass unit is 1/12th the mass of an atom of carbon-12... for practical purposes, it's the mass of one proton or neutron.
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| If you know the masses and abundances (as a percent) of each isotope of an element, the average atomic mass is the [...] of the mass times the abundance of each isotope. | If you know the masses and abundances (as a percent) of each isotope of an element, the average atomic mass is the sum of the mass times the abundance of each isotope.
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| To find the average atomic mass of an element, just take the [...] for each isotope and [...] those numbers all together. | To find the average atomic mass of an element, just take the mass times abundance% for each isotope and add those numbers all together.
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| If an element has two isotopes ( 20% 5 amu; 80% 10 amu) how do you find it's average atomic mass? | average atomic mass = (0.2 * 5 amu) + (0.8 * 10 amu) = 1 amu + 8 amu = _9 amu_
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Created by:
mr.shapard
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