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A(n) ____ is a symbol for an emotional gesture, such as a smile or frown, that you create using keyboard characters.
Protons
Positively charged subatomic particles found in the nucleus of an atom, defining the element's atomic number.
Osmium
A dense, hard, bluish-white transition metal in the platinum group that is the most dense naturally occurring element.
Isotope
A variant of a particular chemical element which differs in neutron number, though it shares the same number of protons.
Electrons
Negatively charged subatomic particles with a very small mass, found orbiting the nucleus of an atom.
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