Which corner of the isotope symbol contains the mass number?
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The top left corner, as we read the symbol on the page.
Explanation:
When we write 126C, the bottom left symbol is the atomic number Z; the top left smbol is the mass number. Since the elemental symbol, the C, automatically specifies the atomic number Z=6, it is redundant, and may be discarded to give just 12C. Reading this symbol, this tells us that we deal with a nucleon with 6 neutrons in the nucleus, 6 massive, neutrally charged, nucular particles.
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