Every electron in an atom is described by a unique set of four quantum numbers:

Question

Every electron in an atom is described by a unique set of four quantum numbers: n, l, m_l, and m_s. The principal quantum number, n, identifies the shell in which the electron is found. The angular momentum quantum number, l, indicates the kind of subshell. The magnetic quantum number, m_l, distinguishes the orbitals within a subshell. The spin quantum number, m_s, specifies the electron spin. Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n, l, m_l, m_s). Check all that apply. 2,-1,1,-1/2 4.3,-5,-1/2 2,2,1,-1/2 3.3,-1,1/2 0,2,0,1/2 1,1,0,-1/2 3,2,2,1/2 3,-2,-1,0 4,2,1,1/2 2,0,0,-1/2 3,1,1,-1/2 3,0,0,1/2 Identify the sets of quantum numbers that describe all the electrons in the ground state of a neutral beryllium atom, Be. Each set is ordered (n, l, m_l, m_s). Drag the appropriate items to their respective bins.

Explanation / Answer

n     l          ml         ms

3      2        2              +1/2

4      2        1               +1/2

2      0        0              -1/2

3      1          1            -1/2

3     0          0              +1/2

Be =4 1s22s2

                 n      l                ml         ms

1s2          1    0 0 +1/2

   1 0    0 -1/2

2s2 2 0    0 +1/2

2 0    0 -1/2   

not beryleium atom

              2          1           -1           +1/2

              2         1              -1           -1/2

             2          1              0         +1/2

              2          1             0         -1/2

              2         1              -1          +1/2

               2        1               -1        -1/2

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