by, of, to, in, after, without, between
1. D. I. Mendeleyev made ... a thorough study ... the relation ... the
atomic weights... the elements and their properties. 2. Mendeleyev’s periodic
table consisted ... seventeen columns. 3 . a general way Mendeleyev’s
table resembled ... the present periodic table ... the noble gases.
4. Mendeleyev placcd... a number... elements... different positions. 5. The
periodic law was accepted ... its proposal... Mendeleyev. 6. M ost... the
elements occur ... the periodic table ... the order ... increasing atomic
weights. 7. Mendeleyev predicted the existence ... six elements
corresponding... vacant places... his table. 8. The properties... the newly
discovered elements were very close ... the properties predicted ... him
