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For the indicated atom in each of the following molecules or ions, give the number and arrangement of the electron pairs around that atom.

(a) As in AsO43-
number:
arrangement:
linear
bent
trigonal planar
square planar
tetrahedral

(b) Se in SeO42-
number:
arrangement:

linear
bent
trigonal planar
square planar
tetrahedral

(c) S in H2S
number:
arrangement:

linear
bent
trigonal planar
square planar
tetrahedral

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  1. If you search around, Dr. Bob222 has posted some nice links on how to solve these types of problems.

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  2. could u check if im right:
    a. As in AsO43-

    for number its 3
    arrangement is tetrahedral

    b. Se in SeO42-
    # is 2
    arrangement is tetrahedral

    c. S in H2S
    # is 1
    arrangement is linear

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