The Sum of number of lone pairs in central atom in IF5 and IF7 is:
Approach Solution - 1
Step 1: Lone Pairs in IF5
Valence electrons:
- Iodine (I): 7 valence electrons
- Fluorine (F): 7 valence electrons × 5 fluorine atoms = 35
- Total valence electrons: \( 7 + 35 = 42 \)
Bonding electrons:
- 5 I-F bonds = \( 5 × 2 = 10 \) bonding electrons
Remaining electrons:
- \( 42 - 10 = 32 \) electrons used to complete the octet of fluorine atoms
- \( 2 \) electrons left on iodine, forming 1 lone pair
Step 2: Lone Pairs in IF7
Valence electrons:
- Iodine (I): 7 valence electrons
- Fluorine (F): 7 valence electrons × 7 fluorine atoms = 49
- Total valence electrons: \( 7 + 49 = 56 \)
Bonding electrons:
- 7 I-F bonds = \( 7 × 2 = 14 \) bonding electrons
Remaining electrons:
- \( 56 - 14 = 42 \) electrons used to complete the octet of fluorine atoms
- No electrons left on iodine, so there are 0 lone pairs on iodine
Step 3: Total Lone Pairs on the Central Atom
The sum of lone pairs on iodine in IF5 and IF7 is:
\( 1 + 0 = 1 \)
Final Answer:
The total number of lone pairs on the central atoms in IF5 and IF7 is: 1.
Approach Solution -2
The correct answer is 0.1.00
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Concepts Used:
D and F Block Elements
The d-block elements are placed in groups 3-12 and F-block elements with 4f and 5f orbital filled progressively. The general electronic configuration of d block elements and f- block elements are (n-1) d 1-10 ns 1-2 and (n-2) f 1-14 (n-1) d1 ns2 respectively. They are commonly known as transition elements because they exhibit multiple oxidation states because of the d-d transition which is possible by the availability of vacant d orbitals in these elements.
They have variable Oxidation States as well as are good catalysts because they provide a large surface area for the absorption of reaction. They show variable oxidation states to form intermediate with reactants easily. They are mostly lanthanoids and show lanthanoid contraction. Since differentiating electrons enter in an anti-penultimate f subshell. Therefore, these elements are also called inner transition elements.
Read More: The d and f block elements