which scientists attempted to classify element into periods?
1. The first attempts to classify elements did Lavoisier and Berzelius, who shared all known elements to metals and non-metals. 2. In 1829, German chemist Döbereiner combined elements to several groups of three elements in each group. 3. In 1857, Englishman Odling, and in 1862 Frenchman Shankurtua placed elements in increasing of atomic masses and set the frequency of changes in their chemical properties. 4. In 1864, Newlands divided the all known elements into groups of 8 elements in each group. 5. L. Meyer in 1864 placed 44 of the 64 known elements in six groups according to increasing their atomic weight. 6. In 1869 Mendeleev divided the all known elements into periods.