Examlex
The printing press was invented by ________ in 1450.
Isotope
Variants of a particular chemical element which differ in neutron number, and consequently in mass, but not in electrical charge.
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.
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