atomic number 2

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Noun

atomic number 2 - a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)

He, helium

chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

argonon, inert gas, noble gas - any of the chemically inert gaseous elements of the helium group in the periodic table

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argonon atomic number atomic number 104 atomic number 21 atomic number 24 atomic number 43 atomic number 44 atomic number 45 atomic number 46 atomic number 48 atomic number 49 atomic number 57 atomic number 61 atomic number 63 atomic number 66 atomic number 71 atomic number 72 atomic number 75 atomic number 76			atomic number 101 atomic number 102 atomic number 103 atomic number 104 atomic number 105 atomic number 106 atomic number 107 atomic number 108 atomic number 109 atomic number 11 atomic number 110 atomic number 111 atomic number 112 atomic number 113 atomic number 114 atomic number 115 atomic number 116 atomic number 12 atomic number 13 atomic number 14 atomic number 15 atomic number 16 atomic number 17 atomic number 18 atomic number 19 atomic number 2 atomic number 20 atomic number 21 atomic number 22 atomic number 23 atomic number 24 atomic number 25 atomic number 26 atomic number 27 atomic number 28 atomic number 29 atomic number 3 atomic number 30 atomic number 31 atomic number 32 atomic number 33 atomic number 34 atomic number 35 atomic number 36 atomic number 37 atomic number 38 atomic number 39 atomic number 4 atomic number 40 atomic number 41 atomic number 42			atomic number 102 atomic number 103 atomic number 104 atomic number 105 atomic number 106 atomic number 107 atomic number 108 atomic number 109 atomic number 11 atomic number 110 atomic number 111 atomic number 112 atomic number 113 atomic number 114 atomic number 115 atomic number 116 atomic number 12 atomic number 13 atomic number 14 atomic number 15 atomic number 16 atomic number 17 atomic number 18 atomic number 19 atomic number 2 atomic number 20 atomic number 21 atomic number 22 atomic number 23 atomic number 24 atomic number 25 atomic number 26 atomic number 27 atomic number 28 atomic number 29 atomic number 3 atomic number 30 atomic number 31 atomic number 32 atomic number 33 atomic number 34 atomic number 35 atomic number 36 atomic number 37 atomic number 38 atomic number 39 atomic number 4 atomic number 40 atomic number 41

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