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(a) The bonding with electrostatic attraction between oppositely charged ions is called . The bonding with electron sharing between two adjacent atoms such that each atom assumes a stable electron configuration is called . The bonding where the positively charged ion cores are shielded from one another, and also "glued" together by the sea of valence electrons is called . (b) Please select statements that satisfy the Pauli exclusion principle. Electrons with the same state must have opposite spins. Electron state can hold no more than four electrons. Electron state can hold no more than two electrons. Electrons with the same state must have the same spins.

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Answer:

a) Ionic bonding

   Covalent bonding

   Metallic bonding

b)  Electrons with the same state must have opposite spins.

    Electron state can hold no more than two electrons.

Explanation:

a) When an atom loses electrons it became a cation, with a positive charge, and when an atom gain electrons it became an anion, with a negative charge. Because of the attraction of the opposite charges, the ions form a bond, which is called ionic bonding.

When atoms share electrons to complete the octet rule, they form a molecule by covalent bonding.

When a metal loses its valence electrons, they form a "sea of electrons" and the cations are "glued" by them, which is called metallic bonding.

b) The Pauli exclusion principle determinants that two electrons can not occupy the same state at the same time, it means that two electrons can't have the same four quantic number equal. If they are at the same shell, they must have different spins. The electron can have only two spin (-1/2 or +1/2) so the electron state can hold no more than two electrons, and they have to have opposite spins.

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