Compounds and mixtures are both types of substances that contain different types of atoms. Alena is given a sample of material that she knows contains both Calcium and Iodine atoms. How will Alena be able to determine if this material is a compound or a mixture? pls hurry!

2points why do scientists need governmental funding? o a. government politicians ask all the important scientific questions. o b. scientists have to pay taxes to the government on the money they make. o c. the cost of doing scientific research can be very high. o d. the government is controlled by scientists. submit

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Which of these conditions most likely produces an unstable isotope?