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Diatomic Elements: Unique situation 2 Identical atoms bonded together Only 7 exist Br2, I2, N2, Cl2, H2, O2, F2 Mnemonic BrINClHOF

br2 = bromine i2 - iodine n2 = nitrogen cl2 = chlorine h2 = hydrogen o2 = oxygen f2 = flourine

Makes a 7 on the periodic table starting with nitrogen ( which is the 7th element )

1 Element

Diatomic elements ( H2 or O2 ) 2 of the same element together

All the same molecules of a compound

Mixture because there is a compound a diatomic element and an element

All pure substances

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