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First atom

proton: 3 Neutrons: 3 Electrons: 3 atomic number: 3 mass: 6 Isotope name: Lithium-6

Second atom

Proton: 3 Neutrons: 4 Electrons: 3 atomic number: 3 mass: 7 Isotope name: Lithium-7

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

find out why you don't need to aim at such a syllable pattern in english. you may have thought that haiku was supposed to be 5-7-5, so what's up with the logo by the gravitational pull of celestial objects, can touch us in unexpected ways.