The characteristics that are common to all elements that were discovered since the 1950s, are 1st, they are a result of the bombardment of previously discovered elements. Say for example Bohrium, discovered in the year 1981, was a result of the bombardment of bismuth and chromium. They are said to be artificially prepared in the laboratory. They are also considered as transuranium elements ( meaning they have atomic number greater than 92 ). Most of the recently discovered elements are said to be radioactive, care must be undertaken.
Answer:
observation
Explanation:
I'm not totally sure but from using context clues it seems like that.
Answer: ik im late but the answers are a, b, and d
Explanation:
I just took the test
The discovery of radioactivity closely followed the discovery of X-Rays. The X-Ray was accidentally invented by Wilhelm Conrad Röntgen in 1895. With the help of his wife, Röntgen tested his wife's hand and captured the bones in her hand and her wedding ring. It became the first röntgenogram and garnered attention from the public and the scientific community.
Answer:
It was a system of numeration based on multiples of ten, often rounded off to the higher power, written in hieroglyphs. The Egyptians had no concept of a place-valued system such as the decimal system.
