When dmitri mendeleev published his periodic table of the elements in 1869, there were 59 known elements. today there are 118 known elements. mendeleev's periodic table, despite the increase in the number of discovered elements, maintains much of its original structure. summarize one feature of mendeleev's periodic table design that made it possible to accommodate new elements.

Listenbase your answer to the question on the information below.nuclear radiation is harmful to living cells, particularly to fast-growing cells, such as cancer cells and blood cells. an external beam of the radiation emitted from a radioisotope can be directed on a small area of a person to destroy cancer cells within the body.cobalt-60 is an artificially produced radioisotope that emits gamma rays and beta particles. one hospital keeps a 100.0-gram sample of cobalt-60 in an appropriate, secure storage container for future cancer treatment.which choice represents the correct product for the beta decay of the co-60? fe-60ni-60fe-61ni-61