Question

Two electrons are found in the same atom. One has the quantum number set (2, 1, -1, +½), and the other has the quantum number set (2, 1, -1, -½). They share the (2 points)
same sublevel, but are in different orbitals.
same orbital, but have different spin directions.
same energy level, but are in different sublevels.
same type of sublevel, but are found in different energy levels.

Answer 1

Answer is: same orbital, but have different spin directions.

The principal quantum number (n) is one of four quantum numbers which are assigned to each electron in an atom to describe that electron's state.  

For principal quantum number n=2:  

1) azimuthal quantum number (l) can be l = 0...n-1:  

l = 0, 1.  

The azimuthal quantum number determines its orbital angular momentum and describes the shape of the orbital.  

2) magnetic quantum number (ml) can be ml = -l...+l.  

ml = -1, 0,+1.  

Magnetic quantum number specify orientation of electrons in magnetic field and number of electron states (orbitals) in subshells.  

3) the spin quantum number (ms), is the spin of the electron.  

ms = +1/2, -1/2.  

Answer 2

Answer:

The correct answer is option B which is they are in same orbital but have different spin.

Explanation:

• The two electrons have quantum number set of (2, 1, -1, +½) and (2, 1, -1, -½).
• The first 3 quanta numbers are same which describe  principal quantum number n, azimuthal quantum number (l) and magnetic quantum number (ml) respectively.
• But the different number is last one which is +1/2 for one electron and -1/2 for other electron.
• This number describe the direction of spin of electron.
• It means one electron spin in clockwise direction, while other in anticlockwise direction.