Question

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Explanation:

Step1: Determine the atomic number of ruthenium

From the periodic table, ruthenium's atomic number is 44. Thus a ruthenium atom contains 44 electrons.

Step2: Calculate the remaining electrons

The noble gas preceding ruthenium is krypton (Kr) with atomic number 36. The remaining electrons are \(44 - 36=8\).

Step3: Determine the orbitals for remaining electrons

The remaining 8 electrons fill the \(5s\), \(4d\) orbitals. The electron configuration is \([Kr]5s^{1}4d^{7}\) (due to the stability of half - filled and filled orbitals, there is a deviation from the simple Aufbau principle filling).

Step4: Evaluate the answer

All 44 electrons in a ruthenium atom have been accounted for. The correct preceding noble gas \([Kr]\) has been used in the notation, and the order of orbital filling (considering stability) for the valence electrons (\(5s\) and \(4d\)) is correct.

Answer:

Atomic number: 44; Number of electrons: 44; Remaining electrons: 8; Orbitals: \(5s\), \(4d\); Electron configuration: \([Kr]5s^{1}4d^{7}\)