Endothermic reactions? i studied them before they were cool

explain what thst means

In which situation can a mixture always be called a solution

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.

The element that has the greatest electronegativity is