HESI RN EXIT EXAM WITH 100% VERIFIED ANSWERS

HESI RN EXIT EXAM WITH 100% VERIFIED ANSWERS What are the most abundant elements of the human body? - Carbon, Hydrogen, Oxygen, Nitrogen 90% of the human body is composed of just four elements which are: - Carbon, Hydrogen, Oxygen, Nitrogen The smallest unit of an element that still retains the chemical and physical properties of the element is called: - Atom Subatomic particles are: - Protons (positive), Neutrons (neutral) and Electrons (negative) All matter is composed of basic substances called - Elements An atom that tells you how many protons an atom has is called: - Atomic Number The number of protons and neutrons is called: - Mass Number What is isotope? - The same element but different number in protons and neutrons-Mass Number (protons plus neutrons) minus Atomic Number (number of protons) equals the number of neutrons. What is radioactive isotope? - Atom whose nucleus undergoes degeneration and in the process gives off radiation What is a molecule? - Atoms bonded together to form a chemical unit What is a compound? - Combining different atoms What is ionic bond? - Ions with opposite charges attract What are ions? - Particle that is electrically charged because it has gained or lost one or more eletrons What is a covalent bonds? - Atoms sharing electrons instead of losing or gain them What is polar bond? - Bond created when electrons shared by adjacent atoms are shared unequally hydrophilic means - water-living Hydrophobic means - water-fearing What is electrolyte? - Substances that release ions when puts into water What is pH? - a measure of hydrogen ion concentration