HELP IM CONFUSED I GIVE BRAINLIEST

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

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.