Which is the correct lewis structure for fluorine, which is a group 7a element?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?

Chortling is used to clean water. another possible atom that would also work is a. sodium b. sulfur c. bromine