Assertion: electron affinity | /r/HasProperty | positive
Facets:
value: in nature
type: LOCATION
Source sentences:
text: 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.
text: For instance the electron affinity for benzene is negative, as is that of naphthalene, while those of anthracene, phenanthrene and pyrene are positive.
text: Therefore, the first electron affinities are negative values and the second electron affinity values of the same species are positive values.
text: Therefore, the first electron affinities are negative values and the second electron affinity values of the same species are positive values.
text: First Electron Affinity (negative energy because energy released): \[ \ce{X (g)
text: Second Electron Affinity (positive energy because energy needed is more than gained): \
text: Notice that electron affinities can be both negative and positive.
text: This means that the energy required overwhelms the energy released by the electron attachment process, and so the second electron affinity will be positive.
text: Not all elements form stable negative ions in which case the electron affinity is zero or even positive.
text: The first electron affinity is always exothermic that is negative the second electron affinity of the same element will be positive or endothermic.
text: Therefore, the second electron affinity and further affinities are positive in nature.
text: These reactions are always exothermic in the gas phase, i.e. energy is released when the reaction advances in the direction shown and enthalpy is negative, while the proton affinity is positive.
text: When an electron is added to a neutral atom (i.e., first electron affinity) energy is released; thus, the first electron affinities are negative.
text: When nonmetals gain electrons, the energy change is usually negative because they give off energy to form an anion (exothermic process); thus, the electron affinity will be negative.
text: Notice that electron affinities can be both negative and positive.
text: Therefore, the first electron affinities are negative values and the second electron affinity values of the same species are positive values.
text: Therefore, the first electron affinities are negative values and the second electron affinity values of the same species are positive values.