Ruthenium (Ru)

Atomic Model Details

Ruthenium (Ru) is a transition metal element. Its atomic structure defines its fundamental chemical and physical characteristics.

Atomic Symbol: Ru
Atomic Number (Z): 44 (Indicates 44 protons in the nucleus)
Average Atomic Mass: 101.07 u (unified atomic mass units)
Protons: 44
Electrons: 44 (in a neutral Ruthenium atom)
Neutrons: Approximately 57 (Calculated as Average Atomic Mass - Atomic Number; for common isotope Ru-102, it is 102 - 44 = 58 neutrons)

The arrangement of electrons in an atom’s shells and subshells dictates its chemical behavior.

Ruthenium exhibits an anomalous electronic configuration due to the stability associated with half-filled or completely filled d-orbitals.

In a neutral Ruthenium atom:

K-shell (n=1): 2 electrons (1s²)
L-shell (n=2): 8 electrons (2s² 2p⁶)
M-shell (n=3): 18 electrons (3s² 3p⁶ 3d¹⁰)
N-shell (n=4): 15 electrons (4s² 4p⁶ 4d⁷)
O-shell (n=5): 1 electron (5s¹) The outermost shell (valence shell) is the 5th shell, containing 1 electron in the 5s subshell, and the penultimate 4d subshell is partially filled with 7 electrons, characteristic of a transition metal.

Ruthenium’s position in Group 8 and Period 5 of the periodic table influences its periodic properties.

The energy required to remove the most loosely bound electron from an isolated gaseous atom.

First Ionization Enthalpy: 710.2 kJ/mol (Energy required to remove the first electron)
Second Ionization Enthalpy: 1620 kJ/mol

A measure of the tendency of an atom to attract a shared pair of electrons.

The energy change when an electron is added to a neutral gaseous atom to form a negative ion.

Electron Gain Enthalpy: -97 kJ/mol (Exothermic process, indicating a tendency to accept an electron, though less pronounced than halogens)

The size of an atom, typically measured as covalent or metallic radius.

Ruthenium is a hard, brittle, silvery-white transition metal.