atomic 87 a radioactive element of the alkali-metal group discovered as a disintegration product of actinium. synonyms: Fr, francium. see moresee less. type of:.

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Name Francium Symbol Fr Atomic Number 87 Atomic Mass 223 0 atomic mass units Number of Protons 87 Number of Neutrons 136 Number of Electrons 87 In 1939 discovered the first isotope of element 87 Dmitrii Ivanovich Mendeleev s eka cesium the heaviest alkali metal for which she proposed the name   Name Francium Symbol Fr Atomic Number 87 Atomic Mass 223 0 atomic mass units Number of Protons 87 Number of Neutrons 136 Number of Electrons 87 Which of the following element has atomic number 87 In 1939 discovered the first isotope of element 87 Dmitrii Ivanovich Mendeleev s eka cesium the heaviest alkali metal for which she proposed the name  

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  • master_6203
    5.0 out of 5 starsVerified Purchase
    แฟรนเซียม
    Reviewed in the Thailand on July 6, 2025
    In 1939 discovered the first isotope of element 87, Dmitrii Ivanovich Mendeleev's eka-cesium, the heaviest alkali metal, for which she proposed the name “ ...
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    Atomic number 87 - Definition, Meaning & Synonyms
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    "Which of the following element has atomic number 87?"
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    Atomic number 87 - Definition, Meaning & Synonyms
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    "Which of the following element has atomic number 87?"
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