Why does the size of an hydride ion varies with the metal ion?

when one electron is added to hydrogen, the no of electrons becomes double the no. of protons. this results in a very large expansion of 1s subshell of Hydride ion.

What are hydrides how are they classified discuss the preparation properties and structure of alkali metal hydrides?

Hydrides are classified into three major groups, depending on what elements the hydrogen bonds to. The three major groups are covalent, ionic, and metallic hydrides. Formally, hydride is known as the negative ion of a hydrogen, H-, also called a hydride ion.

What is hydride gap?

There is a hydride gap where elements do not form hydrides. These metals have low affinity for hydrogen in their normal oxidation state. Therefore, the metals of group 7, 8 and 9 in the periodic table do not form hydrides and this region of periodic table is referred to as the hydride gap.

What do you mean by hydrides explain its different types using its different types with suitable examples?

hydride, any of a class of chemical compounds in which hydrogen is combined with another element. Three basic types of hydrides—saline (ionic), metallic, and covalent—may be distinguished on the basis of type of chemical bond involved.

What are metallic hydrides how do they differ from molecular hydrides?

Metal hydrides have high thermal and electrical conductivity whereas the molecular hydrides have low thermal and electrical conductivity. Metallic hydrides are found in solid state whereas the molecular hydrides are comparatively soft & volatile.

Why hydride ion is bigger than bromide ion?

Now, both theoretically & experimentally, polarizability of hydride ion is greater than bromide. Therefore, H- is larger than Br- in size.

Why are fluoride ions larger than sodium ions?

Fluoride ion has very high lone pair repulsion as compared to other halide thus its size increases more than usual. Both F-&Na+ have same electronic configuration but due to increased nuclear pull radius of Na+ decreases while in F- it increases due to repulsion.

What are the points of difference between Lithium and other alkali metals?

The key difference between Lithium and other alkali metals that we can tell is that the lithium is the only alkali metal that can react with nitrogen whereas the other alkali metals cannot undergo any reaction with nitrogen. Moreover, lithium cannot form an anion while other alkali metals can form anions.

Which group does not form metallic hydride?

This is termed as. dehydride.

What are the different types of hydrides classify them with proper examples?

Three basic types of hydrides—saline (ionic), metallic, and covalent—may be distinguished on the basis of type of chemical bond involved.

What is the name of the ionic hydride?

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.

Do metals affect the size of the H- ion?

Hmmm, there may some slight increase in the size of the H- ion with metals that hold onto the valence electron (s) less strongly, just because the electron spends less time, on the average, near the positive ion. For example, the hydride ion may be larger for cesium vs. lithium hydride. Could you provide some examples?

What is the electronic configuration of the hydride ion?

The simplest anion is the hydride ion, which consists of two electrons and a proton. Therefore, the electronic configuration of hydride ion is 1 S 2.

What determines the type of hydride an element will form?

The position of an element in the periodic table is a good guide to the type of hydride it will form. The alkali and alkaline earth metals (on the left of the table above) form ionic hydrides in which hydrogen is the acid radical.