element with atomic 87 17 ต.ค. 2568 — Francium is one of the naturally occurring rarest elements on earth, symbol Fr and atomic number 87. Francium is an element belonging to the ...

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23 ก ย 2548 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   23 ก ย 2548 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   1 ม ค 2565 Francium barely exists Only 30 grams of the element atomic number 87 reside in the entirety of Earth s crust as estimates suggest Francium is a chemical element it has symbol Fr and atomic number 87 It is extremely radioactive its most stable isotope francium 223 originally called  23 ก ย 2548 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  

• ไทยลีก 2023-24 • เกม250 • Rambo168TrueMoneyWallet • สล็อต dk7 com เครดิตฟรี 108 • เวฟยู • • Francium • Francium - Element information, properties and uses • #87 - Francium - Fr • Francium (Atomic Number 87), the Last Discovered Natural ... • Francium: The Radioactive Element • January 7, 1939: The 83rd Anniversary of the Discovery ... • The chemical element of francium – structural features and ... • แฟรนเซียม • Francium • Francium - Element information, properties and uses

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  • ultra4347
    5.0 out of 5 starsVerified Purchase
    Francium
    Reviewed in the Thailand on July 6, 2025
    17 ต.ค. 2568 — Francium is one of the naturally occurring rarest elements on earth, symbol Fr and atomic number 87. Francium is an element belonging to the ...
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  • mega_1940
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    The chemical element of francium – structural features and ...
    Reviewed in the Thailand on July 17, 2025
    Element 87 would be a reactive alkali metal, the heaviest member of the family lithium, sodium, potassium, rubidium and caesium.
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  • master8580
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    Francium: The Radioactive Element
    Reviewed in the Thailand on June 25, 2025
    Element 87 would be a reactive alkali metal, the heaviest member of the family lithium, sodium, potassium, rubidium and caesium.
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