Which corner of the isotope symbol contains the mass number?

Answer 1

The top left corner, as we read the symbol on the page.

When we write #""^12""_6C#, 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.

For the #""^13C# and #""^14C# isotopes, how many neutrons in each such atom? And how many electrons? Why?

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Answer 2

Naomi Aronson

Upper left corner

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Answer 3

Cameron Andrews

The upper left corner of the isotope symbol contains the mass number.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.