Question

Consider the addition of an electron to the following atoms from the third period. Rank the atoms in order from the most negative to the least negative electron affinity values based on their electron configurations. Atom or ion Electron configuration Cl 1s22s22p63s23p5 Si 1s22s22p63s23p2 Ar 1s22s22p63s23p6 Rank the electron affinity from most negative to least negative. To rank items as equivalent, overlap them

Answer 1

Cl,Si,Ar

Step-by-step explanation:

Electron affinity is defined as the change in energy (in kJ/mole) of a neutral atom (in the gaseous phase) when an electron is added to the atom to form a negative ion. In other words, the neutral atom's likelihood of gaining an electron.

When an electron is added to a neutral atom (i.e., first electron affinity) energy is released; thus, the first electron affinities are negative. However, more energy is required to add an electron to a negative ion (i.e., second electron affinity) which overwhelms any the release of energy from the electron attachment process and hence, second electron affinities are positive.

Chlorine (Cl) = -349 kJ mol⁻¹

Silicon = -135Kj/mol

Argon = -96kj/mol