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argon

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The Simple English Wikipedia has an article on:

chlorine 18 potassium or kalium

Pronunciation

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Noun

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Singular
argon

Plural
none

  1. (uncountable) A chemical element (symbol Ar) with an atomic number of 18.
  2. Argon is a gas, often used in light bulbs to change the colour of the light.
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The Periodic Table
H   He
Li Be   B C N O F Ne
Na Mg   Al Si P S Cl Ar
K Ca   Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr   Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
 
Alkali metals Alkaline earth metals Lanthanides Actinides Transition elements Other metals Metalloids Other nonmetals Halogens Noble gases
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