
Give examples of ionic hydride, molecular hydrides, interstitial hydride, electron precise hydride.
Answer
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Hint: The term hydride refers to an anion of hydrogen. Hydrogen generally forms a proton, but when it forms a compound with an element with lower electronegativity, it forms a hydride.
Complete step by step answer:
- Let us start this question by understanding the term hydride. ‘Hydride’ is formally the anion of hydrogen, i.e. when hydrogen makes a compound with an element of lesser electronegativity. It is represented as . As we can see, in hydrides, the oxidation number of hydrogen is -1.
> When hydrogen combines with different elements it forms different type of hydride –
1) Ionic hydride: When hydrogen forms a compound with group IA elements, it forms an ionic hydride.
Example – Lithium Hydride (LiH), Sodium Hydride (NaH), Potassium hydride (KH).
2) Molecular hydride: These kinds of hydrides are formed by electron-rich compounds (generally p-block elements).
Example – Water , Ammonia
3) Interstitial hydride: These are also known as metallic halides. This type of halide is generally formed by d-block elements.
Example – Zinc Hydride , Scandium Hydride
4) Electron precise hydride: The compounds which have the exact number of electrons to form normal covalent bonds form electron precise halides. Group 14 compounds form this type of element.
Example – Methane
Additional Information: Electronegativity of hydrogen is 2.2. Fluorine is the most electronegative element of the periodic table, with an electronegativity about 3.98.
Note: In group 6, Chromium is the only element to form a hydride. Elements from Group 7, 8 and 9 of the periodic table do not form hydride. This is also known as hydride gap. Hydride gap occurs because the electronegativity of these elements is higher than that of hydrogen.
Complete step by step answer:
- Let us start this question by understanding the term hydride. ‘Hydride’ is formally the anion of hydrogen, i.e. when hydrogen makes a compound with an element of lesser electronegativity. It is represented as
> When hydrogen combines with different elements it forms different type of hydride –
1) Ionic hydride: When hydrogen forms a compound with group IA elements, it forms an ionic hydride.
Example – Lithium Hydride (LiH), Sodium Hydride (NaH), Potassium hydride (KH).
2) Molecular hydride: These kinds of hydrides are formed by electron-rich compounds (generally p-block elements).
Example – Water
3) Interstitial hydride: These are also known as metallic halides. This type of halide is generally formed by d-block elements.
Example – Zinc Hydride
4) Electron precise hydride: The compounds which have the exact number of electrons to form normal covalent bonds form electron precise halides. Group 14 compounds form this type of element.
Example – Methane
Additional Information: Electronegativity of hydrogen is 2.2. Fluorine is the most electronegative element of the periodic table, with an electronegativity about 3.98.
Note: In group 6, Chromium is the only element to form a hydride. Elements from Group 7, 8 and 9 of the periodic table do not form hydride. This is also known as hydride gap. Hydride gap occurs because the electronegativity of these elements is higher than that of hydrogen.
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