Textbook Problem 1.E.25

[805377003]

Can someone explain how to do this problem?

Give the notation for the valence-shell configuration (including the outermost d-electrons) of (a) the alkali metals; (b) Group 15 elements; (c) Group 5 transition metals; (d) the “coinage” metals (Cu, Ag, Au).

[Josh Chou 3K]

The alkali metals have a valence shell with the configuration ns¹, with n being the principal quantum number of the atom. Similarly, a valence shell for a group 15 atom would have the configuration ns²np³. A group 5 transition metal would have a configuration of (n-1)d³ns². The coinage metals are an exception in that they have 10 electrons in their d shell but only 1 electron in their s shell, taking on a (n-1)d¹⁰ns¹ configuration

[505352202]

The alkali metals have a valence shell with the configuration ns¹, with n being the principal quantum number of the atom. Similarly, a valence shell for a group 15 atom would have the configuration ns²np³. A group 5 transition metal would have a configuration of (n-1)d³ns². The coinage metals are an exception in that they have 10 electrons in their d shell but only 1 electron in their s shell, taking on a (n-1)d¹⁰ns¹ configuration

I got the same answers as you did but for C the answer from the test book is
(n−1)d5 ns2
Can someone explain why this is the answer and not (n-1)d3 ns2?

Thank you!

[Ivy Tan 1E]

The alkali metals have a valence shell with the configuration ns¹, with n being the principal quantum number of the atom. Similarly, a valence shell for a group 15 atom would have the configuration ns²np³. A group 5 transition metal would have a configuration of (n-1)d³ns². The coinage metals are an exception in that they have 10 electrons in their d shell but only 1 electron in their s shell, taking on a (n-1)d¹⁰ns¹ configuration

I got the same answers as you did but for C the answer from the test book is
(n−1)d5 ns2
Can someone explain why this is the answer and not (n-1)d3 ns2?

Thank you!

Hi!
The solutions manual on sapling says that the answer to C) is (n-1)d3ns2 for group 5 transition metals, which is correct because group 5 metals have 3 valence electrons in the d orbital and 2 valence electrons in the s orbital (maybe you were looking at the wrong question possibly?) Hope this clarifies though!

[505352202]

The alkali metals have a valence shell with the configuration ns¹, with n being the principal quantum number of the atom. Similarly, a valence shell for a group 15 atom would have the configuration ns²np³. A group 5 transition metal would have a configuration of (n-1)d³ns². The coinage metals are an exception in that they have 10 electrons in their d shell but only 1 electron in their s shell, taking on a (n-1)d¹⁰ns¹ configuration

I got the same answers as you did but for C the answer from the test book is
(n−1)d5 ns2
Can someone explain why this is the answer and not (n-1)d3 ns2?

Thank you!

Hi!
The solutions manual on sapling says that the answer to C) is (n-1)d3ns2 for group 5 transition metals, which is correct because group 5 metals have 3 valence electrons in the d orbital and 2 valence electrons in the s orbital (maybe you were looking at the wrong question possibly?) Hope this clarifies though!

I thought I was looking at the wrong question too but I don't think I am. Here is the link to the screenshot of the textbook answer for 1.E.25 https://drive.google.com/file/d/15V9YZz ... sp=sharing

Am I looking at the wrong thing? Thanks for the help!

[Katie Lam 2J]

I got the same answers as you did but for C the answer from the test book is
(n−1)d5 ns2
Can someone explain why this is the answer and not (n-1)d3 ns2?

Thank you!

Hi!
The solutions manual on sapling says that the answer to C) is (n-1)d3ns2 for group 5 transition metals, which is correct because group 5 metals have 3 valence electrons in the d orbital and 2 valence electrons in the s orbital (maybe you were looking at the wrong question possibly?) Hope this clarifies though!

I thought I was looking at the wrong question too but I don't think I am. Here is the link to the screenshot of the textbook answer for 1.E.25 https://drive.google.com/file/d/15V9YZz ... sp=sharing

Am I looking at the wrong thing? Thanks for the help!

I don't think you are looking at the wrong thing. I got (n-1)d3ns2 as well, so I believe the answer for 1E.25 c) is a typo.

[505352202]

Hi!
The solutions manual on sapling says that the answer to C) is (n-1)d3ns2 for group 5 transition metals, which is correct because group 5 metals have 3 valence electrons in the d orbital and 2 valence electrons in the s orbital (maybe you were looking at the wrong question possibly?) Hope this clarifies though!

I thought I was looking at the wrong question too but I don't think I am. Here is the link to the screenshot of the textbook answer for 1.E.25 https://drive.google.com/file/d/15V9YZz ... sp=sharing

Am I looking at the wrong thing? Thanks for the help!

I don't think you are looking at the wrong thing. I got (n-1)d3ns2 as well, so I believe the answer for 1E.25 c) is a typo.

Thank you!

[Anirudh Mahadev 1G]

I had the same issue, thank you everyone!