Duduli

Reason:- Nitrogen with n=2 have only s & p orbitals.it does not have d orbital to expands it's covalence beyond four. That is why it doesn't form penthalides.but phosphorus have vacant d orbital in their valence shell so it forms pentahalides. Are you satisfied by this answer.

Answer:- The minimum amount of energy required to remove an electron from the valence shell of an isolated gaseous neutral atom is called ionisation enthalpy or energy. Ionisation enthalpy decreases down the group due to gradual increase in atomic size.down the group effective nuclear force decreases on valence electron so ionisation enthalpy is less as compared to top elements of that group.

The tendency of an atom to attract bond pair of electrons towards it's self is called electronegativity. Electronegativity value in general decreases down the group with increase in atomic size.however amongst the heavier elements the order is not that much pronounced. fluorine is most electronegativity element in periodic table while ceasium & francium are least electronegativity element.

Answer:- Ferrimagnetism is observed when the magnetic moments of the domains in the substances are aligned in parallel and antiparallel directions in unequal number. I.e they are weakly attracted by magnetic field as compared to ferromagnetism substances.on heating These are became paramagnetism. e.g fe3o4 etc. Are you satisfied by this answer

Answer:- Metal ions in antiferromagnetic substances are placed in several small regions called domains. But their domains are oppositely oriented and cancel out each other's magnetic moments.i.e e.g MnO show antiferromagnetism. Are you satisfied by this answer

Answer:- These substances are strongly attracted by magnetic field. metel ions in ferromagnetic substances are grouped together into several small regions called domains .each domain act as a tiny magnet. In an unmagnetised piece of ferromagnetic substance the domains are randomly oriented and their magnetic moments get cancelled.when the substance is placed in magnetic field all the domains get oriented in the direction of magnetic field and A strong magnetic effect is produced this is the reason why ferromagnetic substances are strongly attracted by magnetic field.this ordering of domains persist even when the magnetic field is removed. So the ferromagnetic substances are permanently  magnetised. e.g iron,Cobalt,nickel etc.

Answer:- Diamagnetic substances are weakly repelled by magnetic field.they are weakly magnetised in a magnetic field in opposite direction.diamagnetic character is shown by those substances which have no unpaired electrons and have all paired electrons.pairing electrons cancel their magnetic moments and they loss their magnetic property so these are called diamagnetic substances. e.g Water,NaCl, benzene etc. Are you satisfied by this Answer