The Brainliest Answer!
1)Dmitri Mendeleev discovered elements.

2)An element is a substance that is made entirely from one type of atom.For example, the element hydrogen is made from atoms containing a single proton and a single electron. If you change the number of protons an atom has, you change the type of element it is.
3 4 3
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Dmitri element is something made up of atoms
1 3 1