Electron Configuration

What is the electron configuration of the Fe^2+ ion?

• 1s2 2s2 2p6 3s2 3p6 4s2 3d6

• 1s2 2s2 2p6 3s2 3p6 4s1 3d6

• 1s2 2s2 2p6 3s2 3p6 4s2 3d5

• 1s2 2s2 2p6 3s2 3p6 4s2 3d7

What is the exception in the electronic configuration of chromium (Cr)?

• 4s2 3d5

• 4s1 3d5

• 4s2 3d6

• 4s2 3d4

Write the electron configuration of the Cl^- ion.

• 1s^2 2s^2 2p^6 3s^1 3p^6

• 1s^2 2s^2 2p^5 3s^2 3p^6

• 1s^2 2s^2 2p^6 3s^2 3p^6

• 1s^2 2s^2 2p^6 3s^2 3p^5

What is the electron configuration of the transition element Cu?

• [Ar] 3d9 4s2

• [Kr] 3d10 4s2

• [Ne] 3d10 4s1

• [Ar] 3d10 4s1

What is the electron configuration of the noble gas krypton (Kr)?

• [Kr] 3d10 4s2 4p6

• [Ar] 3d10 4s2 4p6

• [Ar] 3d8 4s2 4p6

• [Ne] 3d10 4s2 4p6

How many valence electrons does the element in the third row and group 13 have?

• 5

• 4

• 6

• 3

According to the orbital filling rules, what is the order of filling of the orbitals?

• 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p

• 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, 8s, 5g

• 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, 8s

• 1s, 2s, 3s, 4s, 5s, 6s, 7s, 2p, 3p, 4p, 5p, 6p, 7p, 3d, 4d, 5d, 6d, 4f, 5f

Write the electron configuration of the Mg^2+ ion.

• 1s2 2s1 2p6

• 1s2 2s3 2p6

• 1s2 2s2 2p6

• 1s2 2s2 2p5

What is the exception in the electronic configuration of the transition element copper (Cu)?

• It has 8 valence electrons instead of 9.

• It has 11 valence electrons instead of 9.

• It has 10 valence electrons instead of 9.

• It has 12 valence electrons instead of 9.

What is the electron configuration of the noble gas xenon (Xe)?

• [Kr] 4d10 5s2 5p6

• [Xe] 4f14 5d10 6s2

• [Ar] 3d10 4s2 4p6

• [Ne] 3s2 3p6