Write all the exceptions in the chapter 's-block elements' and explain each in detail. EXPERT PLEASE ANSWER
Dear student,
i) Reactivity towards air
All group members react differently
Li forms monoxide , Na forms peroxide and rest all forms supeoxide.
ii) Potassium is lighter than Sodium whereas ieally density decreases down the group.
iii)Li has most negative electrode potential due to small size.
iv)The alkali metals readily react vigorously with halogens to form ionic halides, M+X- . Li forms covalent compound with halides.
v) All halides of I group is soluble in water except LiF and CsI due to high lattice enthalpy and small hydration enthalpy respectively.
vi)Mg has exceptionally low melting point in II group due to small size.
vii) Beryllium halides are covalent in nature whereas other halides are ionic in nature. Also they exist in chain structure or in dimer form in vapour phase.
viii) Be shows diagonal relationship with Al of III group.
Regards
i) Reactivity towards air
All group members react differently
Li forms monoxide , Na forms peroxide and rest all forms supeoxide.
ii) Potassium is lighter than Sodium whereas ieally density decreases down the group.
iii)Li has most negative electrode potential due to small size.
iv)The alkali metals readily react vigorously with halogens to form ionic halides, M+X- . Li forms covalent compound with halides.
v) All halides of I group is soluble in water except LiF and CsI due to high lattice enthalpy and small hydration enthalpy respectively.
vi)Mg has exceptionally low melting point in II group due to small size.
vii) Beryllium halides are covalent in nature whereas other halides are ionic in nature. Also they exist in chain structure or in dimer form in vapour phase.
viii) Be shows diagonal relationship with Al of III group.
Regards