Among LiH, NaH, KH, RbH, and CsH, the correct order of increasing ionic character is:
Correct answer: B. LiH < NaH < KH < RbH < CsH
- A. LiH > NaH > CsH > KH > RbH
- B. LiH < NaH < KH < RbH < CsH
- C. RbH > CsH > NaH > KH > LiH
- D. NaH > CsH > RbH > LiH > KH
Explanation
The ionic character of a bond is determined by the difference in electronegativity between the two atoms. As you move down the alkali metal group, the electronegativity of the metal decreases, which increases the electronegativity difference between the metal and hydrogen. This leads to an increase in ionic character down the group.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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