This element has 49 electrons surrounding its nucleus what is that element

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Nonpoint source pollution is difficult to control because it

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp