Physics, 24.01.2020 18:31, Queenjlife2583

Isotope ? -20 has an atomic mass of 20.
90.9% of all atoms of element ? are of this form.
isotope ? -21 has an atomic mass of 21.
0.3% of all atoms of element ? are of this form.
isotope ? -22 has an atomic mass of 22.
8.8% of all atoms of element ? are of this form.

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Isotope ? -20 has an atomic mass of 20.
90.9% of all atoms of element ? are of this form.