HESI (nursing entrance exam) Questions and Answers|100% Verified

HESI (nursing entrance exam) Questions and Answers|100% Verified What are the most abundant elements of the human body? - CORRECT ANSWER Carbon, Hydrogen, Oxygen, Nitrogen 90% of the human body is composed of just four elements which are: - CORRECT ANSWER Carbon, Hydrogen, Oxygen, Nitrogen The smallest unit of an element that still retains the chemical and physical properties of the element is called: - CORRECT ANSWER Atom Subatomic particles are: - CORRECT ANSWER Protons (positive), Neutrons (neutral) and Electrons (negative) All matter is composed of basic substances called - CORRECT ANSWER Elements An atom that tells you how many protons an atom has is called: - CORRECT ANSWER Atomic Number The number of protons and neutrons is called: - CORRECT ANSWER Mass Number What is isotope? - CORRECT ANSWER 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? - CORRECT ANSWER Atom whose nucleus undergoes degeneration and in the process gives off radiation What is a molecule? - CORRECT ANSWER Atoms bonded together to form a chemical unit What is a compound? - CORRECT ANSWER Combining different atoms What is ionic bond? - CORRECT ANSWER Ions with opposite charges attract What are ions? - CORRECT ANSWER Particle that is electrically charged because it has gained or lost one or more eletrons What is a covalent bonds? - CORRECT ANSWER Atoms sharing electrons instead of losing or gain them What is polar bond? - CORRECT ANSWER Bond created when electrons shared by adjacent atoms are shared unequally