A. Atomic Mass. The average atomic mass is the number at the bottom of each square Found by averaging the natural abundances of its isotopes Atomic mass = # p + + n 0. Mass #. Atomic #. B. Isotopes. Atoms of the same element with different mass numbers. Nuclear symbol:.
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Atomic #B. Isotopes
Rows & Columns
Actinides - part of period 7B. Table Sections
3A 4A 5A 6A 7AB. Periodic Trends