Basic Chemistry Final Exam Questions All Answered Correct 2025 Updated.

matter - Answer anything that occupies space and has mass element - Answer a pure substance that cannot be broken down into other substances by chemical reactions compound - Answer substance containing two or more elements chemically combined in a fixed ratio atom - Answer the smallest particle of an element that retains the properties of the element proton - Answer subatomic particle having a positive charge; found in nucleus electron - Answer subatomic particle having a negative charge; not in nucleus but surrounds it neutron - Answer subatomic particle without a charge; found in nucleus nucleus - Answer protons and neutrons together; make up the center of an atom atomic number - Answer identifies a specific element; equals the number of protons in an atom of each element radioactive isotope - Answer an unstable atom in which the nucleus decays (breaks down) releasing particles and energy isotope - Answer atoms having the same numbers of protons but different numbers of neutrons ionic bond - Answer occurs when atoms transfer electrons to other atoms ion - Answer atoms that have lost or gained electrons covalent bond - Answer occurs when atoms share electrons