HESI (nursing entrance exam) 2023/2024 What are the most abundant elements of the human body? - ANSWER Carbon, Hydrogen, Oxygen, Nitrogen
90% of the human body is composed of just four elements which are: -
ANSWER Carbon, Hydrogen, Oxygen, Nitrogen The smallest unit of an element that still retains the chemical and physical properties of the element is called: - ANSWER Atom 1 / 4
Subatomic particles are: - ANSWER Protons (positive), Neutrons (neutral) and Electrons (negative) All matter is composed of basic substances called - ANSWER Elements
An atom that tells you how many protons an atom has is called: - ANSWER
Atomic Number The number of protons and neutrons is called: - ANSWER Mass Number 2 / 4
What is isotope? - 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? - ANSWER Atom whose nucleus undergoes degeneration and in the process gives off radiation What is a molecule? - ANSWER Atoms bonded together to form a chemical unit What is a compound? - ANSWER Combining different atoms 3 / 4
What is ionic bond? - ANSWER Ions with opposite charges attract What are ions? - ANSWER Particle that is electrically charged because it has gained or lost one or more eletrons What is a covalent bonds? - ANSWER Atoms sharing electrons instead of losing or gain them What is polar bond? - ANSWER Bond created when electrons shared by adjacent atoms are shared unequally hydrophilic means - ANSWER water-living
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