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Every atom is composed of a nucleus and one or more electrons bound to the nucleus . | Wiki1k:wikipedia:902:2:0 | 12 | bound | true | bind | [
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Every atom is composed of a nucleus and one or more electrons bound to the nucleus . | Wiki1k:wikipedia:902:2:0 | 12 | bound | true | bind | [
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The nucleus is made of one or more protons and typically a similar number of neutrons . | Wiki1k:wikipedia:902:2:1 | 3 | made | true | make | [
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The nucleus is made of one or more protons and typically a similar number of neutrons . | Wiki1k:wikipedia:902:2:1 | 3 | made | true | make | [
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Protons and neutrons are called nucleons . | Wiki1k:wikipedia:902:2:2 | 4 | called | true | call | [
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Protons and neutrons are called nucleons . | Wiki1k:wikipedia:902:2:2 | 4 | called | true | call | [
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If an atom has more or fewer electrons than protons , then it has an overall negative or positive charge , respectively , and it is called an ion . | Wiki1k:wikipedia:902:2:6 | 3 | has | true | have | [
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Stability of isotopes is affected by the ratio of protons to neutrons , and also by the presence of certain `` magic numbers '' of neutrons or protons that represent closed and filled quantum shells . | Wiki1k:wikipedia:902:40:0 | 4 | affected | true | affect | [
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Stability of isotopes is affected by the ratio of protons to neutrons , and also by the presence of certain `` magic numbers '' of neutrons or protons that represent closed and filled quantum shells . | Wiki1k:wikipedia:902:40:0 | 29 | represent | true | represent | [
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Stability of isotopes is affected by the ratio of protons to neutrons , and also by the presence of certain `` magic numbers '' of neutrons or protons that represent closed and filled quantum shells . | Wiki1k:wikipedia:902:40:0 | 32 | filled | true | fill | [
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These quantum shells correspond to a set of energy levels within the shell model of the nucleus ; filled shells , such as the filled shell of 50 protons for tin , confers unusual stability on the nuclide . | Wiki1k:wikipedia:902:40:1 | 3 | correspond | true | correspond | [
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Also , only four naturally occurring , radioactive odd -- odd nuclides have a half-life over a billion years : potassium-40 , vanadium-50 , lanthanum-138 and tantalum-180m . | Wiki1k:wikipedia:902:40:3 | 5 | occurring | true | occur | [
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Most odd -- odd nuclei are highly unstable with respect to beta decay , because the decay products are even -- even , and are therefore more strongly bound , due to nuclear pairing effects . | Wiki1k:wikipedia:902:40:4 | 28 | bound | true | bind | [
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Most odd -- odd nuclei are highly unstable with respect to beta decay , because the decay products are even -- even , and are therefore more strongly bound , due to nuclear pairing effects . | Wiki1k:wikipedia:902:40:4 | 28 | bound | true | bind | [
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As even the most massive atoms are far too light to work with directly , chemists instead use the unit of moles . | Wiki1k:wikipedia:902:43:0 | 11 | work | true | work | [
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As even the most massive atoms are far too light to work with directly , chemists instead use the unit of moles . | Wiki1k:wikipedia:902:43:0 | 17 | use | true | use | [
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This number was chosen so that if an element has an atomic mass of 1 u , a mole of atoms of that element has a mass close to one gram . | Wiki1k:wikipedia:902:43:2 | 3 | chosen | true | choose | [
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Because of the definition of the unified atomic mass unit , each carbon-12 atom has an atomic mass of exactly 12 u , and so a mole of carbon-12 atoms weighs exactly 0.012 kg . | Wiki1k:wikipedia:902:43:3 | 6 | unified | true | unify | [
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Because of the definition of the unified atomic mass unit , each carbon-12 atom has an atomic mass of exactly 12 u , and so a mole of carbon-12 atoms weighs exactly 0.012 kg . | Wiki1k:wikipedia:902:43:3 | 30 | weighs | true | weigh | [
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Hence after two half-lives have passed only 25 % of the isotope is present , and so forth . | Wiki1k:wikipedia:902:52:2 | 5 | passed | true | pass | [
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