On what basis hydrides are classified into ionic, covalent and metallic hydrides?
Binary Compounds of hydrogen with other elements are called hydrides.The type of hydride which an element forms depends on the electronegativity of the element,and hence on the type of the bond formed.The electronegativity of hydrogen is 2.1,thus more electropositive element formed ionic hydride.p-block elements formed covalent hydrides because the electronegativity difference between H and p-block element is small.Many d-block elements and some lanthanides and actinides elementsform metallic hydrides.Hence the nature of hydride depends upon the nature of element combining with hydrogen.On the basis of type of bonding in hydrides,these are classified into the following three classes.
1.Ionic or salt like hydrides
2.Covalent or molecular hydrides
3.Metallic or interstitial hydrides
Binary Compounds of hydrogen with other elements are called hydrides.The type of hydride which an element forms depends on the electronegativity of the element,and hence on the type of the bond formed.The electronegativity of hydrogen is 2.1,thus more electropositive element formed ionic hydride.p-block elements formed covalent hydrides because the electronegativity difference between H and p-block element is small.Many d-block elements and some lanthanides and actinides elementsform metallic hydrides.Hence the nature of hydride depends upon the nature of element combining with hydrogen.On the basis of type of bonding in hydrides,these are classified into the following three classes.
1.Ionic or salt like hydrides
2.Covalent or molecular hydrides
3.Metallic or interstitial hydrides
