Oxygen
Silicon
Hydrogen
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108
114
121
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Periods
Groups
Columns
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Helium
Krypton
Carbon
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Noble gases
Actinides
Metals
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Mixture
Addition
Combination
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NaCa
NaCl
NaC
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Potassium
Chlorine
Krypton
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Crimson
Greenish
Violet
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Lithium
Zirconium
Dubnium
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