Elements are distinguished from each other by the number of protons present in their nuclei. True
False

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?

Fossil fuels are organic compounds that are made from

How many valence electrons are in atom of radon?