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chemistry (elements (hydrogen, helium, lithium, berilium, boron, carbon,…
chemistry
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elements
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vary in appearance and have physical change points they follow trends although there are exceptions.
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metals
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there is a large variety eg platinum,copper,steel etc
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hydrogen
test for hydrogen by having it in a test tube and placing a lit splint in it if the hydrogen makes a squeaky pop then you can tell its hydrogen.