# Chemistry

How do you write the electron configuration of Curium (Cm) and copper (Cu)? I'm confused of writing electron configuration with d and f orbitals. Please help. Thanks.

1. 👍 0
2. 👎 0
3. 👁 268
1. Cm has 96 electrons. The previous noble gas is radon, Rn, with 86 electrons. It is a 7th row element and a member of the actinide series which starts with Ac, 3rd element on the 7th row and 7th element on the actinium series. The electron configuration is:
[Rn] 7s^2, 6d^1, 5f^7
Note that the
[Rn] accounts for 86 electrons.
7s^2 shows a full s-subshell in the 7th row (2 electrtons).
6d^1 shows 1 d-electron 1 shell below the last one (7th) since it is the first element in the d-block of the 7th row.
5f^7 shows 7 f-electrons, 2 shells below the 7th.

1. 👍 0
2. 👎 0
2. and Cu is 4s^2,3d^9 ?
Just want to make sure:
So if it is Holmium (Ho), is the electron configuration 6s^2, 5d^1, 4f^10 ?

Thank You.

1. 👍 0
2. 👎 0
3. 5f^14 and 5f^7 is stable ( 5f^7 : all spin is up), so you cannot drive 5f^8 instead of 5f^7 6d^1

1. 👍 0
2. 👎 0
4. You can check out electron configurations of the elements by going to www.webelements.com , click on the elements, then scroll down to electron shell properties found on the right side of the page.

1. 👍 0
2. 👎 0
5. I don't get it.
Why is Cm [Rn].5f7.6d1.7s2, but Ho [Xe].4f11.6s2 ? Why isn't Ho [Xe].6s^2, 5d^1, 4f^10 ?
Help needed. Thanks

1. 👍 0
2. 👎 0
6. http://www.uwuses.uwaterloo.ca/~cchieh/cact/c120/eleconfg.html

The above is a site with a lot of reading but it has some pictures and diagrams that may make it a little easier to understand than we can do on these boards. I think one important detail for you to remember is that no set of rules will allow one to fill the energy levels and make no mistakes. That is, there are exceptions that must be memorized. For example, the electron configuration for 28Ni is 1s2 2s2 2p6 3s2 3p6 3d8 4s2. Adding one more electron to make 29Cu we might expect to find 1s2 2s2 2p6 3s2 3p6 3d9 4s2 but that is not correct. The addition of the one electron changes the 3d and 4s energy levels just enough that it is 1s2 2s2 2p6 3s2 3p6 3d10 4s1. So this is an exception we must memorize. In the 3d series of elements (21 through 30), Cr and Cu are the two elements that don't follow the "correct" pattern. We have exceptions in the 4d, 4f, and 5f series, also.

1. 👍 0
2. 👎 0
7. Ho is the element of the Lanthanide series, the Lanthanides have the electrons are arranged into the orbital 4f.If you start from the element La (Z= 57), write the electron configuration of La,Ce(Z= 58),..., to Ho(Z=67) , you will understand why Ho=[Xe]4f11 6s2, it cannot 6s2, 5d1, 4f10 because the electrons are arranged into the lower energy level first, the energy level of 5d >4f

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry: Electron Configurations

Write the electron configuration for the following ion. V3+ I got 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. In simplified form, I got [Ar]4s^2. I checked my answer against the answer given in the back of my chemistry textbook, and the two

asked by Anonymous on November 4, 2009
2. ### chemistry

Identify the neutral element represented by this excited-state electron configuration, then write the ground-state electron configuration for that element. Excited State: 1s2 2s2 2p2 3s1 Element Symbol: ? Ground State: ?

asked by Kim on September 30, 2013
3. ### Chemistry

how do i write the complete electron configuration for Ga3+ and Mg2+????????????

asked by mariana on August 4, 2013
4. ### Chemistry

1) What is the atomic # for selenium? 34 2) Write the full electron configuration for selenium following the (n+l) rule? I am not sure what is meant by n+l 3) write the electron configuration, grouping electrons by their "n"

asked by Hannah on November 1, 2011
5. ### Chemistry

Metals lose electrons under certain conditions to attain a noble-gas electron configuration. How many electrons must be lost by the element Ca? Is it 2 e^-? Which noble-gas electron configuration is attained in this process? argon

asked by Bill on October 28, 2012
1. ### Lauren

Write the electron configuration of Sn and Sn2+ Give the electron configuration of Cu+ and Cu2+

asked by Chemistry on November 14, 2007
2. ### Chemistry

-Calcium chloride contains calcium and chloride ions. Write the ground-state electron configuration for the calcium ion. -Write the ground-state electron configuration for the chloride ion.

asked by Aaron on November 21, 2017
3. ### Chemistry

What is electron configuration of Bi5+?

asked by Anonymous on February 19, 2008
4. ### CHEM

Consider the following neutral electron configurations in which 'n' has a constant value. Which configuration would belong to the element with the most negative electron affinity, E-ea? a) ns^2 b) ns^2 np^2 c) ns^2 np^5 d) ns^2

asked by K on November 13, 2007
5. ### AP Chemistry

Which of the following electron configurations correspond to an excited state? Identify the atoms and write the ground-state electron configuration where appropriate. If the configuration is a noble gas, enter the noble gas in

asked by Ferdinand on October 30, 2011
6. ### Physics

A 0.62-mm-diameter copper wire carries a tiny current of 2.0 μA . The molar mass of copper is 63.5 g/mole and its density is 8900 kg/m3. NA=6.02×1023 Estimate the electron drift velocity. Assume one free electron per atom.

asked by Jeff on March 4, 2018