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Why are ionic hydrides of only alkali metals and alkaline earth metals are known? Give two examples.

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Ionic hydrides are commonly known as saline hydrides or pseudohalides. These compounds form between hydrogen and the most active metals, especially with the alkali and alkaline-earth metals of group one and two elements. In this group, the hydrogen acts as the hydride ion (H−). They bond with...
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Ionic hydrides are commonly known as saline hydrides or pseudohalides. These compounds form between hydrogen and the most active metals, especially with the alkali and alkaline-earth metals of group one and two elements.

In this group, the hydrogen acts as the hydride ion (H−). They bond with more electropositive metal atoms. Ionic hydrides are usually binary compounds (i.e., only two elements in the compound) and are also insoluble in solutions. Now I hope you can form your own examples, but common examples are Sodium Hydride (NaH), Lithium hydride (LiH), Potassium hydride (KH) etc.

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Alkali metals and alkaline earth metals are most electropositive due to low ionization ethalpy therefore they form ionic hydrides, e.g. NaH, KH and CaH2
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Alkali metals and alkaline earth metals are most electropositive due to low ionization ethalpy therefore they form ionic hydrides, e.g. NaH, KH and CaH2

 
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Ionic hydrides are commonly known as saline hydrides or pseudohalides. These compounds form between hydrogen and the most active metals, especially with the alkali and alkaline-earth metals of group one and two elements.
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Ionic hydrides are commonly known as saline hydrides or pseudohalides. These compounds form between hydrogen and the most active metals, especially with the alkali and alkaline-earth metals of group one and two elements.

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Related Questions

State as to why
(a) Alkali metals show only +1 oxidation state. (b) Na and K impart colour to the flame but Mg does not.(c) Lithium on being heated in air mainly forms the monoxide and not the peroxide.(d) Li is the best reducing agent in aqueous solution.

a) There is only one valence electron in Alkali metals, on loosing one electron alkali metals achieve noble gas configuration which is most stable. Therefore, in order to achieve stability Alkali metals...
Abhijith
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Which one of the following alkaline earth metal carbonates is thermally most stable?
(a) MgCO3 (b) CaCO3 (c) SrCO3 (d) BaCO3

MgCO3 is most stable alkaline earth metal because it is present in first period.Due to this its nuclear charge is less as compare to other.Due to its less nuclear charge its bond length is small thus it is more stable.
Vinay
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Name the alkali metal which shows diagonal relationship with magnesium?

Alkali Metal LITHIUM shows diagonal relationship with Alkaline Earth Metal MAGNESIUM
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Which of the following is used in photoelectric cells?
(a) Na (b) K (c) Li (d) Cs
Cs is used in the photoelectric cell due to the lowest ionization enthalpy among all alkali metals.
Jitesh
Which of the following is not a peroxide?
(a) KO2(b) CrO5(c) Na2O2 (d) BaO2
Correct answer is option (c). Because A peroxide is a compound containing oxygen oxygen single bond. The way you can identify it when it is in a compound is by using the valence electron of the partner...
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