Which of the following statements does not describe the structure of an atom?
a) An atom has a small, dense center called the nucleus.
b) Inside the nucleus of an atom are protons and electrons.
c) Protons are positively charged sub-atomic particles.
d) Electrons are negatively charged sub-atomic particles.
b) Inside the nucleus of an atom are protons and electrons.
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A neutral atom of helium has 2 protons and ______ electrons. (Enter a whole number.)
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A neutral atom of helium has 2 protons and 2 electrons.
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An atom with 5 protons, 6 neutrons, and 5 electrons has an atomic mass of _____ amu. (Enter a whole number.)
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