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Which metal does not form ionic hydride-...

Which metal does not form ionic hydride-

A

`Na`

B

`Rb`

C

`Ca`

D

`Be`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which metal does not form an ionic hydride, we need to understand the characteristics of ionic hydrides and the metals that typically form them. ### Step-by-Step Solution: 1. **Understanding Ionic Hydrides**: Ionic hydrides are formed when metals react with hydrogen, resulting in a compound where the metal donates an electron to hydrogen. This typically occurs with metals that have a larger atomic size, allowing them to form stable cations. 2. **Identifying Metals**: The metals that commonly form ionic hydrides include alkali metals (like sodium, potassium) and alkaline earth metals (like calcium). These metals have larger atomic sizes and can easily lose an electron to form cations. 3. **Analyzing Beryllium**: Beryllium (Be) is an alkaline earth metal but has a significantly smaller atomic size compared to other metals in its group. Due to its smaller size, beryllium tends to form covalent compounds rather than ionic ones. 4. **Fajan's Rule**: According to Fajan's rule, larger cations tend to form ionic bonds, while smaller cations (like beryllium) have a higher tendency to form covalent bonds due to their polarizing power. Beryllium's small size leads to a strong attraction to the electrons of hydrogen, resulting in covalent hydrides instead of ionic hydrides. 5. **Conclusion**: Based on the above analysis, the metal that does not form ionic hydrides is **Beryllium (Be)**. ### Final Answer: Beryllium (Be) does not form ionic hydrides.
To determine which metal does not form an ionic hydride, we need to understand the characteristics of ionic hydrides and the metals that typically form them. ### Step-by-Step Solution: 1. **Understanding Ionic Hydrides**: Ionic hydrides are formed when metals react with hydrogen, resulting in a compound where the metal donates an electron to hydrogen. This typically occurs with metals that have a larger atomic size, allowing them to form stable cations. 2. **Identifying Metals**: The metals that commonly form ionic hydrides include alkali metals (like sodium, potassium) and alkaline earth metals (like calcium). These metals have larger atomic sizes and can easily lose an electron to form cations. ...
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