Pl HELP in TIMED The atomic number of iron is 26 and the atomic mass of its most common isotope is 56. How many electrons are in an atom of iron?

26

82

56

30

How are ionic bonds formed and what is the attractive force within an ionic bond

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

The polymer used for the nonstick surface of cooking utensils is 24.0%c and 76%f by mass. what is the empirical formula of this polymer?