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FinnBinn FinnBinn
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11 years ago
The question on my review says "Draw the atomic diagram of the magnesium atom (24/12 Mg).

Like- the 24 is over the 12 but there's no line between them.

I'm confused as to what the 24 and 12 are.  I just know Magnesium's atomic number is 12.

This is a review and I'm trying to remember how to do this for the test.


Can anyone explain how I would do this?
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11 years ago
OK the 12 is the atomic number and the 24 is the atomic mass (rounded).

You need those to find the number of neutrons.  The atomic mass minus the atomic number is your number of neutrons.  The atomic number = the number of electrons = the number of protons.

You're gonna be able to fit two of the electrons in the first shell and 8 in the second shell, the leftover two go in the third one.
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