Posted by **lavonne** on Tuesday, November 23, 2010 at 3:20pm.

I have a big exam tomorrow. Can anyone tell me any easy way to figure out the 4 quantum numbers, n, l, ml, and ms. i still get confused especially with the n and ml!

- chemistry Please help! -
**DrBob222**, Tuesday, November 23, 2010 at 4:53pm
Four quantum numbers. Four rules to remember. That makes it easy.

n = 1, 2, 3, 4, etc in increments of 1.

l = 0, 1, 2, etc up to a max of n-1.

ml = -l to +l in increments of +1 (including 0)

ms = two values; either +1/2 or -1/2

So l depends on n. ml depends on l

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