Which of the following is a possible set of quantum numbers for an electron?
(1, 1, 0, +½)
(1, 0, 0, +½)
(3, 2, 3, -½)
(3, -1, 0, -½)

- tywower

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- tywower

@UnkleRhaukus

- tywower

@ganeshie8

- tywower

@Australopithecus

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## More answers

- tywower

@perl

- tywower

HIII UNCLE RHAUKUS

- UnkleRhaukus

HI !

- tywower

*UNKLE

- tywower

i'm kinda lost on this question :(

- UnkleRhaukus

lets look at the QM numbers one at a time

- UnkleRhaukus

the first one is n ; the principal QM, it represent the electron shell
n has to be some positive natural number

- UnkleRhaukus

all the n's in the options are valid

- UnkleRhaukus

the second QN , \(\ell\); is the subshell
this can be values from 0 up n-1

- UnkleRhaukus

this makes of two of the options invalid,
can you tell me which two?

- UnkleRhaukus

Yes the options have the second term: either not greater than 0, or not less than n
so they can't be right

- UnkleRhaukus

we have these options left:
(1, 0, 0, +½)
(3, 2, 3, -½)

- UnkleRhaukus

the third quantum number is the magnetic quantum number, \(m_\ell\)
this can be any integer less than or equal in magnitude to \(\ell\)
_____
for example if \(n\) was 5 and \(ell\) was 4,
\(m_{\ell}\) could be -4, -3, -2, -1, 0 , 1, 2, 3, or 4

- UnkleRhaukus

\(ell\)*\(\ell\)

- UnkleRhaukus

The final quantum number is related to the spin of the electron, \(m_s\)
this can only take values of: \(+\tfrac12\) or \(-\tfrac12\)

- UnkleRhaukus

Only one of the options has both:
the second QN less than the first (but non-negative),
and
the third QN less than or equal to (in magnitude) the second

- UnkleRhaukus

Which option is this @tywower?

- tywower

the third one

- UnkleRhaukus

nope,
the third option has
the third QN greater than (in magnitude) the second QN

- tywower

can u explain why it's the second one :)

- UnkleRhaukus

A. (1, 1, 0, +½)
not this one, \(\ell\not0\)

- tywower

thank you so much @UnkleRhaukus u are absolutley amazing! can u help me with some more?

- UnkleRhaukus

more Q numbers?

- tywower

No, they're just questions I'm having a hard time understanding :)

- UnkleRhaukus

ok,

- tywower

Such as:
Which of the following pairs of elements could possibly be found in the same group on the periodic table?
A is an alkali metal, B forms a 1- ion.
A has the atomic number 20, B forms a 2- ion.
A is a noble gas, B has seven valence electrons.
A forms a -3 ion, B has five valence electrons.

- UnkleRhaukus

What kind of ions do metals form? + or - ?

- tywower

+

- UnkleRhaukus

so could the first option possibly be true?

- tywower

maybe

- UnkleRhaukus

elements in a group (column) always form the same kind of ions
e.g.
Mg^+, Ca^+, are ions of group II,
F^-, Cl^-, Br^-, are ions of group VII

- UnkleRhaukus

If A and B are of the same group,
and A (a metal) forms ^+ ions, could B form ^- ions?

- UnkleRhaukus

@tywower

- tywower

@UnkleRhaukus

- tywower

@UnkleRhaukus

- UnkleRhaukus

@tywower

- tywower

sorry i got distracted

- tywower

lol

- UnkleRhaukus

@tywower

- tywower

@UnkleRhaukus it's the last one right

- UnkleRhaukus

perhaps

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