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The time for a planet to revolve around the Sun is its _.
Sr
Strontium, a chemical element with symbol Sr and atomic number 38, known for its bright-red flames in fireworks.
Isotope
Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number, but have the same number of protons.
Isotope
Forms of a specific chemical element distinguished by having identical proton counts yet varying quantities of neutrons within their cores.
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