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Atomic Structure & Periodicity

5 terms


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Atomic Structure & Periodicity

Effective Nuclear Charge

The net positive charge actually experienced by a particular electron after allowing for shielding by other electrons.

Z_eff = Z − σ Dimensionless
Atomic Structure & Periodicity

Electron

A negatively charged fundamental particle that occupies orbitals around the nucleus and governs chemical bonding.

m_e = 9.109 × 10⁻³¹ kg u
Atomic Structure & Periodicity

Electron Affinity

The energy change when one mole of gaseous atoms each gains an electron to form gaseous negative ions.

X(g) + e⁻ → X⁻(g) kJ/mol
Atomic Structure & Periodicity

Electron Configuration

The notation describing how an atom's electrons are distributed among its available orbitals.

1s² 2s² 2p⁶ … Dimensionless
Atomic Structure & Periodicity

Electronegativity

The relative tendency of an atom in a covalent bond to attract the shared pair of electrons towards itself.

ΔEN determines bond polarity Dimensionless