Input interpretation
europium | number of valence electrons
Result
![Determine the number of valence electrons in: europium (Eu) Plan: • Look up the abbreviated (condensed) ground electronic configuration. • Use the electronic configuration to identify the outermost electrons. • Use the principal quantum number to identify the valence electrons. The abbreviated ground electronic configuration for europium is: [Xe]6s^24f^7 Electrons in atomic orbitals outside of the xenon core, [Xe], are the outermost electrons: 6s^24f^7 Extract the principal quantum number, n, for the outermost electrons from the electron configuration: electron configuration | n | orbital | number of electrons 6s^2 | 6 | s | 2 4f^7 | 4 | f | 7 The outermost electrons with the largest principal quantum number (in this case, n = 6) are valence electrons. So the number of valence electrons in europium is: Answer: | | 2](../image_source/832e7324b0dc655ad4cab1aea85a7d01.png)
Determine the number of valence electrons in: europium (Eu) Plan: • Look up the abbreviated (condensed) ground electronic configuration. • Use the electronic configuration to identify the outermost electrons. • Use the principal quantum number to identify the valence electrons. The abbreviated ground electronic configuration for europium is: [Xe]6s^24f^7 Electrons in atomic orbitals outside of the xenon core, [Xe], are the outermost electrons: 6s^24f^7 Extract the principal quantum number, n, for the outermost electrons from the electron configuration: electron configuration | n | orbital | number of electrons 6s^2 | 6 | s | 2 4f^7 | 4 | f | 7 The outermost electrons with the largest principal quantum number (in this case, n = 6) are valence electrons. So the number of valence electrons in europium is: Answer: | | 2
Corresponding quantity
Moles of electrons from n = N/N_A: | 3.3×10^-24 mol (moles)