Number of valence electrons for nitrogen

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?

Which statement accurately represents the arrangement of electrons in bohr’s atomic model?

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