Atoms and Molecules

Question Answer
What is a positively charged particle in the nucleus of an atom? Proton.
What is the region surrounding an atom's nucleus where one or more electrons are often found? Electron cloud.
What is a negatively charged particle that occupies the space in an atom outside the nucleus? Electron.
What is one or more atoms of an element having the same number of protons, but a different number of neutrons? Isotope.
What is the region at the center of an atom that contains most of the mass of an atom? Nucleus.
What is an atom that has a charge because it has gained or lost electrons? Ion.
What is the number of protons in the nucleus of an atom of an element? Atomic number.
What is the uncharged particle in the nucleus of an atom? Neutron.

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