Magnetism

The maximum number of electrons in a subshell is determined by the formula ,
where is the angular momentum quantum number. This is because for a given , there are possible values of the magnetic quantum number , and each can hold two electrons (one with spin and one with spin ).
Thus, the maximum number of electrons that can be accommodated in a subshell is .

The correct option is (B):

When electrons are transferred between two dissimilar atoms, they form an ionic bond. The term "electrovalent bond" is often used interchangeably with ionic bond because it involves the transfer of electrons to form ions that are held together by electrostatic forces. An electrostatic bond also refers to the attractive force between positively and negatively charged ions, which is the essence of an ionic bond. Therefore, all of these terms (electrovalent bond, ionic bond, electrostatic bond) refer to the same type of bonding.
Thus, the correct answer is that all of these bonds are formed due to the transfer of electrons between dissimilar atoms.

The correct option is (D): All of these