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Question
Write the expected formulas for the hydrides of 4th-period elements. What is the trend in the formulas? In what way the first two members of the series different from the others?
Solution
The expected formulas for the hydrides of 4th-period elements MH4 (electron precise). M2H6 (electron-deficient) and MH3 (electron-rich).
The trend in the formula is
- Electron precise hydrides – CH4, C2H6, SiH4, GeH4
- Electron deficient hydrides – B2H6
- Electron rich hydrides – NH3, H2O
The first two members of the series KH, CaH2 are ionic hydrides whereas the other members of the series CH4, C2H6, SiH4, B2H6, NH3 are covalent hydrides.
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