Q: What makes up the mass number of an atom? Choices: - electrons and neutrons - atoms and neutrons - molecules and electrons - protons and neutrons A:
protons and neutrons
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Q: The volume of a gas is comprised of about 10% matter. what is the rest? Choices: - open space - instead space - normal space - empty space A:
empty space
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Q: What structure is an organelle that contains enzymes that break down and digest unneeded cellular components? Choices: - peroxisome - tissue - centrosome - lysosome A:
lysosome
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Q: What are electrons at the outermost energy level of an atom are called? Choices: - core electrons - ions - shell electrons - valence electrons A:
valence electrons
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