Question

Give the symbol of the element that meets the following conditions.

has four electrons in energy level n = 3

has four 2p electrons

completes the 4p sublevel

has four electrons in energy level n = 4

has three 2p electrons

completes the 4s sublevel

has three electrons in the 3d sublevel

completes the 3s sublevel

Answer 1

has four electrons in energy level n = 3   1s^2 2s^22p^63s^23p^2   = Si

has four 2p electrons                                1s^2 2s^22p^4                = O

completes the 4p sublevel                         1s^2 2s^22p^63s^23p^64s^23d^104p^6   = Kr

has four electrons in energy level n = 4    1s^2 2s^22p^63s^23p^64s^23d^104p^2 = Ge

has three 2p electrons                              1s^2 2s^22p^3    = N

completes the 4s sublevel                        1s^2 2s^22p^63s^23p^64s^2    = Ca

has three electrons in the 3d sublevel       1s^2 2s^22p^63s^23p^64s^23d^3   = V

completes the 3s sublevel                          1s^2 2s^22p^63s^2     = Mg