Which of the following elements has the electron configuration 2?
Hydrogen
Helium
Sodium
Magnesium
Helium whose atomic number is 2 has electronic configuration 2.
Which of the following element has the electron configuration of 1s2s22p63s23p4?
Which of the following element has duplet as outermost electronic configuration?
Group 14 elements has the following electronic configuration:
An element M has the electron configuration [Ar]3d54s2. So, which of the following oxide cannot exist for element M?