who is the first person that grouped 33 elements categories like gases metals and earths  - a1. antoine lavoisier, who proposed the law of octaves - a2. john newlands , what did the law of octaves state  - a3. element properties repeat every eighth element. , who left gaps for undiscovered elements in the peiodic table - a4. dmitri mendeleev , who also worked on arranging elements but received less credit than mendeleev - lothar meyer, in the modern periodic table elements are arranged by what? - increasing atomic number, what is the main advantage of mandeleev table - it perdicted properties of elements not yet discovered,

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