The atomic number of an element is 15. What is the likely arrangement of the valence and core electrons in a neutral atom of this element?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

The clouds are grey and ground is wet. a quantitative b qualitative

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