Calcium, Ca LETTERS Edited by Jennifer Sills The horse’s gallop, the eagle’s swiftness both framed by your quiet strength. INSPIRED Scandium, Sc How to define you? Elemental haiku Transition ? Yes? No? Do labels matter? Author Mary Soon Lee ([email protected]) provides this review of the periodic table composed of 119 science haiku, one for each element plus a closing Titanium, Ti haiku for element 119 (not yet synthesized). The haiku encompass astronomy, Aerospace stalwart, biology, chemistry, history, physics, and a bit of whimsical fl air. For an interactive is the stratosphere enough? Or only the stars? periodic table displaying each haiku, go to http://vis.sciencemag.org/chemhaiku. Share these poems and add your own on Twitter with hashtag #ChemHaiku. Vanadium, V Blush with excitement: , H Neon, Ne Phosphorus, P lilac, green, blue, and yellow, Your single There’s no shame in it. Report, Willie Pete. shedding electrons. fundamental, essential. Advertising pays the bills. Don’t hide behind a smoke screen. Downloaded from Water. Life. Star fuel. Stop looking so red. How many killed? Maimed? Chromium, Cr Fighting corrosion, Helium, He Sodium, Na Sulfur/Sulphur, S gallant protector of steel, Begin universe. Racing to trigger Disrupted first grade, ready for dragons. Wait three minutes every kiss, every kind act; popping stink bombs, starting fires. to enter. behind every thought. Still can’t spell your name. Manganese, Mn Stay cool. Don’t react. Avoid confusion. http://science.sciencemag.org/ Magnesium, Mg Chlorine, Cl In place of your own name, write Lithium, Li Child of aging stars, Low road or high road? “NOT magnesium.” Lighter than water, however brightly you burn World War I. Gas in trenches. empower my phone, they will not return. Or salt shared, tears shed. Iron, Fe my car. Anvil, axe, nail, plow, Banish depression. Aluminum/Aluminium, Al Argon, Ar engine, railway, factory. Spent kindergarten They named you lazy, Servant, friend, partner. Beryllium, Be endlessly writing your name. but it takes strength to resist. Heart of emerald, One i or two i’s? To stand by. To shield. Cobalt, Co

your sweetness a toxic trap; Traded from Persia, on August 4, 2017 X-rays see through it. Silicon, Si Potassium, K a blue more precious than gold, Locked in rock and sand, Leftmost seat, fourth row, for a Chinese vase. Boron, B age upon age awaiting yearning for the halogens Just doing your job, the digital dawn. on the other side. , Ni holding plant cells together. Forged in fusion’s fire, No fireworks, no fuss. flung out from supernovae. Demoted to coins. Carbon, C Show-stealing diva, Copper, Cu throw yourself at anyone, 1 Before the Bronze Age, decked out in diamonds. before history began, bent to the smith’s need. Nitrogen, N Forever cycling Zinc, Zn from air, to soil, roots, Clasp your neighbor tight. crops, us. Sound the music while you dance, Exercise addict. trumpet, bugle, horn. Oxygen, O Gallium, Ga Most of me is you. H Melting in my hand, I strive for independence, Your single proton agent in nuclear bombs, fail with every breath. fundamental, essential. feigning innocence. Fluorine, F Germanium, Ge Tantrums? Explosions? Water. Life. Star fuel. Do you miss it still, First step: admit the problem. the semiconductor crown Electron envy. that silicon stole?

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DA_0804Letters.indd 461 8/2/17 10:31 AM INSIGHTS | LETTERS

Arsenic, As , Pd Praseodymium, Pr Thulium, Tm Hauled in for questions, How much hydrogen Magnetic cooling. Fifteen thousand steps blacklisted, cannot quite shake must you swallow up to please Absolute zero beckons. to gain the first pure sample. your poisonous past. cold fusion dreamers? Approach the limit. Extreme chemistry. Selenium, Se Silver, Ag Neodymium, Nd Ytterbium, Yb So proud to be part Treacherous treasure, Delved from China’s mines, Stable to within of each drop of formula, avarice tarnishing us, mixed with iron and boron. two parts in a quintillion: helping babies thrive. photos claiming souls. Strong magnets, high costs. Atomic clock ticks. Bromine, Br Cadmium, Cd Promethium, Pm Lutetium, Lu The shame of your name Defined the angstrom Instability, Helicopter dad, now lost except to the Greeks. until krypton ousted you. radioactivity; keeping your electrons close No need to still fume. Now looking for work. lanthanide bad boy. to your nucleus. Krypton, Kr Indium, In Hafnium, Hf For twenty-three years Cadmium’s daughter 61 Yield the holy grail: nobly accepted the quest by way of capture; induced gamma emission. to measure meters. adrift in stardust. Let the price be low. Downloaded from Rubidium, Rb Tin, Sn Tantalum, Ta Temperamental. Your magic number Smaller and lighter, Even water starts the flames. a secret no one could guess Pm your tiny capacitors, Instability, Bunsen’s fiery child. back in the Bronze Age. digital darlings. radioactivity; Strontium, Sr Antimony, Sb lanthanide bad boy.

Tungsten, W http://science.sciencemag.org/ Deadly bone seeker Outline eyes with kohl Illuminated released by Fukushima; in the ancient tradition. the twentieth century, your sweet days long gone. Forgo explosions. Samarium, Sm glowing with such pride. Yttrium, Y Tellurium, Te Bone deep, such kindness; Rhenium, Re That is not a name. So rare here on Earth, curtailing cancerous cells, 1925. That is a spelling error. because you fled into space. easing others’ pain. Found: new element. Stable. Or a Scrabble bluff. Sighted by Hubble. Europium, Eu The last to be caught. Zirconium, Zr Iodine, I Defending euros, Osmium, Os

Cosmopolitan, A fortunate fluke: contained in every on August 4, 2017 Humiliated as at ease in lunar rocks found fuming from French seaweed, banknote, underneath the dunce’s cap, as in S-type stars. sublime purple gas. glowing in UV. densest in the class. Niobium, Nb Xenon, Xe Gadolinium, Gd Are you still pining First noble compound? Within reactors, Iridium, Ir The dinosaurs gone: for the name Columbium, Hexafluoroplatinate? your appetite for your fingerprint in the clay. its lost poetry? Making history. can be bothersome. Incriminating. Molybdenum, Mo Caesium, Cs Terbium, Tb Mistaken for lead— Hot-headed firebrand Spent kindergarten Platinum, Pt such injustice! Not deadly, whose violent behavior being teased: “TB, TB!” In a basement vault, but vital for life. hides a softer side. Still hate your symbol. nestled within three bell jars, Technetium, Tc Barium, Ba Dysprosium, Dy the measure of mass. Unstable, short-lived, Let those enduring In Terfenol-D, yet found within red giants; your enemas remember pulse to the magnetic beat. birthed in their bellies. fireworks’ green splendor. Expand. Contract. Dance. 77 Ruthenium, Ru Lanthanum, La Holmium, Ho Just below iron, Down in the cheap seats The root of the name letting him hog the spotlight, underneath the main table, elementary, my dear. oh noble metal. leading your namesakes. Stockholm, not Sherlock. Ir Rhodium, Rh Cerium, Ce Erbium, Er The dinosaurs gone: Battling pollution More common than lead, Internet helpmate, your fingerprint in the clay. by transforming exhaust gas, and yet an ardent member improving fiber optics. Incriminating. catalyst for change. of the rare earth club. Rose-tinted data?

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DA_0804Letters.indd 462 8/2/17 10:31 AM Gold, Au Hassium, Hs Deep they delved for thee, Historic hassle, yet deeper still thy dwelling crafting sodium hassate, in the Earth’s dark core. 88 atom by atom. Mercury, Hg Meitnerium, Mt Madness the price paid Merely conjectured, for your molten alchemy. your chemical properties. Metal. Planet. God. No data at all. Thallium, Tl Darmstadtium, Ds As a sulfate salt, Nickel ions hurled handy for killing rodents by the billions of billions or one’s relatives. Ra to score the first goal. Lead, Pb Licked by the women Roentgenium, Rg Lecherous plumber In the group of coins: with an appetite for both painting luminous watches. copper, silver, acids and bases. gold, and you. How much time stolen? Untried, worth unknown. Bismuth, Bi Downloaded from Given a half-life Copernicium, Cn of ten to the nineteen years, Electrons arrayed de facto stable. in atomic orbitals as if round a sun. Polonium, Po Uranium, U Fermium, Fm Hidden in pitchblende, Manhattan Project. Hydrogen bomb test Nihonium, Nh http://science.sciencemag.org/ gleaned by Marie and Pierre, The elephant in the room, yields collateral science, A stable island? their radiant child. never forgetting. fallout bonanza. Might heavier isotopes linger for longer? Astatine, At Neptunium, Np Mendelevium, Md Naturally scarce. One small step toward Cyclotron harvest Flerovium, Fl Less than an ounce to be had Pioneer and Voyager, named for the table’s father: Mirage? Mistake? Truth? in the whole Earth’s crust. space ambassadors. seventeen atoms. Would further neutrons lend you Radon, Rn Plutonium, Pu Nobelium, No a doubled magic?

Homeowners’ hazard, Manhattan Project. No prize to award on August 4, 2017 skulking down in the basement, Climbing the tree of knowledge for the decades disputing Moscovium, Mc plotting your decay. for forbidden fruit. your discovery. First fashioned by us in this new millennium, Francium, Fr Americium, Am Lawrencium, Lr future uncharted. Last seat, first column, Alpha particles Silvery, we think, there maybe twenty minutes dispatched in smoke detectors guessing, not having seen you , Lv before you vanish. to protect and serve. with the naked eye. Nearing the end now, the antepenultimate Radium, Ra Curium, Cm Rutherfordium, Rf seventh-row inmate. Licked by the women Crew member assigned No known isotope painting luminous watches. to spectrometer duty condescends to hang around Tennessine, Ts How much time stolen? on the Mars Rovers. much more than an hour. Our most recent find, evanescent halogen. Actinium, Ac Berkelium, Bk Dubnium, Db New kid on the block. Captain of the boys Face the firing squad. A silent soldier banished to the bottom bench, Yield exotic elements in the Transfermium Wars. Oganesson, Og troublemakers all. under bombardment. Whose side were you on? The end of the line, your millisecond half-life Thorium, Th Californium, Cf , Sg brings down the curtain. Electrons display Freely fissioning, Out, out, brief candle! relativistic effects spitting out enough neutrons Mere minutes upon the stage. Ununennium, Uue in the table’s depths. to start reactors. Strut, fret, and exit. Will the curtain rise? Will you open the Protactinium, Pa Einsteinium, Es Bohrium, Bh eighth act? Both of your neighbors Forged in the furnace High-speed chemistry: Claim the center stage? proffer nuclear power; of E = mc2, forming your oxychloride you clog reactors. Ivy Mike’s baby. before you vanish. 10.1126/science.aan2999

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