Basic Biochemistry || A Verified A+ Pass.

Atom correct answers basic unit of matter Nucleus correct answers center of atom electron correct answers negatively charged particle in electron cloud(atomic number = number of protons) proton correct answers positively charged particle at center of atom(atomic number & number of electrons) element correct answers pure substance that consists entirely of one type of atom. isotopes correct answers atoms that differ in the number of neutrons they contain radioactive isotopes correct answers nuclei are unstable and break down at a constant rate over time compound correct answers substance formed by 2 or more elements in definite proportions ionic bind correct answers one or more electrons are transferred from one atom to another ions correct answers electrically charged atoms that have gained or lost electrons. covalent bond correct answers a chemical bond that involves sharing a pair of electrons between atoms in a molecule molecule correct answers two or more atoms held together by covalent bonds van der Waals forces correct answers intermolecule force of attraction polar substance correct answers molecule in which the charges are unevenly distributed (cell membrane is non polar and surrounds cells in our body; some animals use oils to waterproof themselves) hydrogen bond correct answers attraction between a hydrogen atom with a partial positive charge and another atom with a partial negative charge Properties of Water correct answers great solvent high heat capacity polar substance less dense as solid surface tension strong adhesion cohesion