Question

which is the electron configuration for nobelium (no)?
rn7s²5f¹⁴
rn7s²5f⁷
ne3s²3p⁷
xe6s²5d¹

Explanation:

Nobelium (No) has an atomic number of 102. The noble - gas core preceding it is radon (Rn). After the radon core, the electron - filling follows the Aufbau principle. The outermost electrons are in the 7s and 5f orbitals, with 2 electrons in the 7s orbital and 14 electrons in the 5f orbital to complete the f - subshell.

Answer:

[Rn]7s²5f¹⁴