Question

November 12. The electron affinity is the energy released when an electron is added to a neutral atom to make a 1- anion. The table below shows the electron affinities for the 2nd period (row) elements. The value reported is the amount of energy released when an electron is added to a neutral atom. If no energy is released the anion is not stable and that is reported. Explain the overall trend of electron affinity increasing as you move left to right across the period. (1 pt) Atom Electron affinity (V) 0.618 not stable 0.278 1.262 not stable 1.461 3.401 not stable UZO Z No electron affinity is reported for Be, N and Ne, meaning that the negative ion is less stable than the neutral atom. In less than 50 words explain these observations. (1 pt)

Answer 1

ANSWER 1 Electron Affinity is the amount of Energy change I when an electron ů added to a Neutal atom." Xté - xo Neutral atom forms an anion. When electron u adeled to the Neutral atom. to release some - Energy Electron affinity depends on various factors like attractions, screening effect, size of atom etc. I for atoms given that is for Be, N, Ne These atoms have either Halj Jolled or fully folled elechowe electron configuration. Hal filled and fully folled electron configurations are stable so if on election is added to them. The anion coould not be stable as of dis empts the Hall folled and fully filled stable configuration. Be → 18² 25² (Jully filled) Ny 15² 25² 2p3 chaly filled) Ne 15² 25² ap6 fully filled).

for other atoms. Thol. Hoving across the periodic table electron afferity. increases as it shows the attraction between the Nucleus and incoming electons on Moving across the periodic table the Nuclear change increases causes the electrons to feel more attraction towards atom by the Nucleus. so its Electron affinity will be more. Meaning that it will form More stable anion as compared to atom having low election offenity Value. Moving down the periodic table the size of atom increases to the electron afferity value decreases as we love from top to bottom in a penodio table. This is because the distance between the Nucleus and outermost incoming electron increases so there will be less attractions due to More distance between the Nuckus and outermost electon leading to low value of electron affenity.