User:Slightsmile/sandbox

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Monopoly

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Picture of the Day

Picture of the day Castle Square is a historic square in Warsaw, Poland, that serves as the gateway to Warsaw's Old Town. The square features the Royal Castle and Sigismund's Column, and is surrounded by historic townhouses. It forms the starting point of the Royal Route. The Old Town, including Castle Square, suffered extensive damage during World War II and was reconstructed in the postwar period. In 1980, the United Nations Educational, Scientific and Cultural Organization (UNESCO) inscribed the Historic Centre of Warsaw on the list of World Heritage Sites as an example of the near-total reconstruction of a historic town centre. This photograph shows an elevated view of Castle Square in 2024, as seen from the tower of St. Anne's Church, facing roughly northwards. Sigismund's Column can be seen in the foreground on the left, and the Royal Castle is the building on the right of the image. A part of the facade and roof of St. John's Archcathedral is visible in the background.Photograph credit: Rhododendrites Archive – More featured pictures...

In the News

Indonesian protests A magnitude-6.0 earthquake in Afghanistan leaves more than 600 people dead. Protests in Indonesia (pictured) erupt over increased benefits and salaries given to parliament members. Prime Minister of Thailand Paetongtarn Shinawatra is removed from office by the Constitutional Court for misconduct. Targeted strikes by the Israeli Air Force kill several ministers of the Houthi–led government of Yemen, including Prime Minister Ahmed al-Rahawi. Ongoing: Gaza war Russian invasion of Ukraine timeline Sudanese civil war timeline Recent deaths: James Mosley Angela Mortimer Rodion Shchedrin Eusebio Poncela Akinwale Arobieke Maurice Tempelsman Nominate an article

On this Day

September 1: Labour Day in Canada and Labor Day in the United States (2025) Title page of the soprano part book 1610 – Claudio Monteverdi's Vespro della Beata Vergine (page pictured) was first printed in Venice, dedicated to Pope Paul V. 1804 – German astronomer Karl Ludwig Harding discovered one of the largest main-belt asteroids, naming it Juno after the Roman goddess. 1902 – The first science fiction film, titled A Trip to the Moon and based on From the Earth to the Moon by Jules Verne, was released in France. 1937 – The first group of around 172,000 Koreans were deported by Soviet authorities from the Russian Far East to the Kazakh and Uzbek SSRs; around 10 to 25 percent died. 2000 – Speakers' Corner, a free speech area in Hong Lim Park in Singapore, was launched. Hannah Glasse (d. 1770) Father Chrysanthus (b. 1905) Charles Atangana (d. 1943) Barbara Ehrenreich (d. 2022) More anniversaries: August 31 September 1 September 2 Archive By email List of days of the year About

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periodic table

Periodic table Group 1 2   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Hydrogen & alkali metals Alkaline earth metals Triels Tetrels Pnicto­gens Chal­co­gens Halo­gens Noble gases Period 1 Hydro­gen1H​1.0080 He­lium2He​4.0026 2 Lith­ium3Li​6.94 Beryl­lium4Be​9.0122 Boron5B​10.81 Carbon6C​12.011 Nitro­gen7N​14.007 Oxy­gen8O​15.999 Fluor­ine9F​18.998 Neon10Ne​20.180 3 So­dium11Na​22.990 Magne­sium12Mg​24.305 Alumin­ium13Al​26.982 Sili­con14Si​28.085 Phos­phorus15P​30.974 Sulfur16S​32.06 Chlor­ine17Cl​35.45 Argon18Ar​39.95 4 Potas­sium19K​39.098 Cal­cium20Ca​40.078 Scan­dium21Sc​44.956 Tita­nium22Ti​47.867 Vana­dium23V​50.942 Chrom­ium24Cr​51.996 Manga­nese25Mn​54.938 Iron26Fe​55.845 Cobalt27Co​58.933 Nickel28Ni​58.693 Copper29Cu​63.546 Zinc30Zn​65.38 Gallium31Ga​69.723 Germa­nium32Ge​72.630 Arsenic33As​74.922 Sele­nium34Se​78.971 Bromine35Br​79.904 Kryp­ton36Kr​83.798 5 Rubid­ium37Rb​85.468 Stront­ium38Sr​87.62 Yttrium39Y​88.906 Zirco­nium40Zr​91.224 Nio­bium41Nb​92.906 Molyb­denum42Mo​95.95 Tech­netium43Tc​[97] Ruthe­nium44Ru​101.07 Rho­dium45Rh​102.91 Pallad­ium46Pd​106.42 Silver47Ag​107.87 Cad­mium48Cd​112.41 Indium49In​114.82 Tin50Sn​118.71 Anti­mony51Sb​121.76 Tellur­ium52Te​127.60 Iodine53I​126.90 Xenon54Xe​131.29 6 Cae­sium55Cs​132.91 Ba­rium56Ba​137.33 Lute­tium71Lu​174.97 Haf­nium72Hf​178.49 Tanta­lum73Ta​180.95 Tung­sten74W​183.84 Rhe­nium75Re​186.21 Os­mium76Os​190.23 Iridium77Ir​192.22 Plat­inum78Pt​195.08 Gold79Au​196.97 Mer­cury80Hg​200.59 Thallium81Tl​204.38 Lead82Pb​207.2 Bis­muth83Bi​208.98 Polo­nium84Po​[209] Asta­tine85At​[210] Radon86Rn​[222] 7 Fran­cium87Fr​[223] Ra­dium88Ra​[226] Lawren­cium103Lr​[266] Ruther­fordium104Rf​[267] Dub­nium105Db​[268] Sea­borgium106Sg​[269] Bohr­ium107Bh​[270] Has­sium108Hs​[271] Meit­nerium109Mt​[278] Darm­stadtium110Ds​[281] Roent­genium111Rg​[282] Coper­nicium112Cn​[285] Nihon­ium113Nh​[286] Flerov­ium114Fl​[289] Moscov­ium115Mc​[290] Liver­morium116Lv​[293] Tenness­ine117Ts​[294] Oga­nesson118Og​[294] Lan­thanum57La​138.91 Cerium58Ce​140.12 Praseo­dymium59Pr​140.91 Neo­dymium60Nd​144.24 Prome­thium61Pm​[145] Sama­rium62Sm​150.36 Europ­ium63Eu​151.96 Gadolin­ium64Gd​157.25 Ter­bium65Tb​158.93 Dyspro­sium66Dy​162.50 Hol­mium67Ho​164.93 Erbium68Er​167.26 Thulium69Tm​168.93 Ytter­bium70Yb​173.05   Actin­ium89Ac​[227] Thor­ium90Th​232.04 Protac­tinium91Pa​231.04 Ura­nium92U​238.03 Neptu­nium93Np​[237] Pluto­nium94Pu​[244] Ameri­cium95Am​[243] Curium96Cm​[247] Berkel­ium97Bk​[247] Califor­nium98Cf​[251] Einstei­nium99Es​[252] Fer­mium100Fm​[257] Mende­levium101Md​[258] Nobel­ium102No​[259] Primordial  From decay  Synthetic Border shows natural occurrence of the element Standard atomic weight Ar, std(E)[1] Ca: 40.078 — Abridged value (uncertainty omitted here)[2] Po: [209] — mass number of the most stable isotope s-block f-block d-block p-block

1. Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–291. doi:10.1515/pac-2015-0305.
2. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.