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   When was rutherfordium discovered?

   • The American synthesis was independently confirmed in 1973 and secured the identification of rutherfordium as the parent by the observation of K-alpha X-rays in the elemental signature of the 257 Rf decay product, nobelium-253. As a consequence of the initial competing claims of discovery, an element naming controversy arose.

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   Is rutherfordium a chemical element?

   • Rutherfordium is a synthetic chemical element; it has symbol Rf and atomic number 104. It is named after physicist Ernest Rutherford. As a synthetic element, it is not found in nature and can only be made in a particle accelerator. It is radioactive; the most stable known isotope, 267 Rf, has a half-life of about 48 minutes.

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   Is rutherfordium radioactive?

   • It is radioactive; the most stable known isotope, 267 Rf, has a half-life of about 48 minutes. In the periodic table, it is a d-block element and the second of the fourth-row transition elements. It is in period 7 and is a group 4 element. Chemistry experiments have confirmed that rutherfordium behaves as the heavier homolog to hafnium in group 4.

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   What is the atomic radius of rutherfordium?

   • The atomic radius of rutherfordium is expected to be ~150 pm. Due to relativistic stabilization of the 7s orbital and destabilization of the 6d orbital, Rf + and Rf 2+ ions are predicted to give up 6d electrons instead of 7s electrons, which is the opposite of the behavior of its lighter homologs.

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2. en.wikipedia.org › wiki › RutherfordiumRutherfordium - Wikipedia

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   5 hours ago · Rutherfordium is a synthetic chemical element; it has symbol Rf and atomic number 104. It is named after physicist Ernest Rutherford. As a synthetic element, it is not found in nature and can only be made in a particle accelerator. It is radioactive; the most stable known isotope, 267 Rf, has a half-life of about 48 minutes.

3. en.wikipedia.org › Timeline_of_New_Zealand_historyTimeline of New Zealand history - Wikipedia

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   1 day ago · 29 January: William Hobson arrives in the Bay of Islands and reads out the proclamation of sovereignty. 6 February: Hōne Heke is the first to sign the Treaty of Waitangi at Bay of Islands. 21 May: Hobson proclaims British sovereignty over New Zealand. The North Island by treaty and the South Island by discovery.

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5. y2calculate.com › 2nd-test2nd Test - y2calculate.com

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   1 day ago · Which scientist is credited with the discovery of the proton through the use of positive rays? A. J.J. Thomson. Ernest Rutherford. James Chadwick. Eugen Goldstein.