1. An isotope is an atom of an element that varies in mass number due to variati

1. An isotope is an atom of an element that varies in mass number due to variation in the number of: (Points: 5)atoms.protons.neutrons.electrons.2. A covalent bond is: (Points: 5)the attraction that one atom has for another atom.the attraction between two atoms formed by the sharing of electrons.formed between the positive charge of a hydrogen atom in one molecule and the negative charge of anitrogen atom in another nearby molecule.the attraction between a positive ion and a negative ion.3. Solutions are always comprised of: (Points: 5)solvents and solute.liquids and solids.water and salts.compounds and ions.4. Which of the following is a chemical reaction that is also known as digestion? (Points: 5)PhosphorylationDehydration synthesisAcid-baseHydrolysis