Question

Predict the charges of the monatomic (single-atom) ions formed by these main-group elements.

Part A

Se

Express your answer as an integer with the appropriate sign.

Part B

K

Express your answer as an integer with the appropriate sign.

Answer 1

Answers:

Part A: -2      (minus sign 2)

Part B: +1     (plus sign 1)

1) The charges of single - atoms always be 0.
2) The charge of ion is equal to its charge.
With Se ( column 6) has 6 electrons in outermost shell, it needs two more electron to satisfy the octet rule, so the charge on Br is - 2

3) But potassium should lose one electron to achieve octet configuration hence +1.

Please see the following pdf file for more information.

http://academic.pgcc.edu/~bsuitte/chem%201010/Nomenclature_Worksheets%20covers%20all.pdf

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