An atom of iron has the atomic number 26 and a mass number of 56. how many protons plus neutrons are in the nucleus? a. 30b. 26c. 56d. 82

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

How do you know when a chemical reaction has occurred

Which of the following best describes technology a. something created for only scientists to use b.the method of thinking that scientists use. c.the application of engineering to create useful products. c. a scientific idea