HESI (Entrance Exam) |839 questions| with correct answers

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