2. Consider the XeF cation How many valence electrons does this cation have? a.

Question

2. Consider the XeF cation How many valence electrons does this cation have? a. 22 b. 80 c.. 28 correct answer d, 30 Consider the XeF cation What is the VSEPR notation for this cation? a. AXE b. AX c. AXE d. AX3E2 correct answer Consider the xeF, T cation. What is the shape of the molecular cation. (NOT the electronic shape.) a. "T" shape correct answer b. trigonal planar c. trigonal pyramidyl d. trigonal bipyramidyl Which ones of the four VSEPR notations listed below will represent a species that i polar? I. AX4; IL AX4E; III. AX4E2; IV. AX2E3 a. II, and IV b. None of these are polar c. II only correct answer d. I, III, and IV

Explanation / Answer

Xe is noble gas: so

Xe = 8, complete octet

F is halogen, so it has 7

3F = 3*7 = 21

then

21+8 = 29 electrons

-1 in the ionization

29-1 = 28 electrons

Q2.

XeF3+1

For this...

A --> Xe

X = 3 since 3 fluorines atoms

E --> 2 since two lone pairs from Xe

geometry --> trigonal bipyramidal

Q4.

AX4 --> nonpolar, since they cancel each other

AX4E --> polar, since pole is present

AX4E2 --> poles cancel so nonpolar

AX2E3 --> poles cancel so nonpolar

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