The electron affinities of which group of elements are positive?
The electron affinities of which group of elements are positive?
The correct option is A Zero
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.Electron affinity increases upward for the
groups and from left to right across periods of a periodic table because the
electrons added to energy levels become closer to the nucleus, thus a stronger
attraction between the nucleus and its electrons. Remember that greater the
distance, the less of an attraction; thus, less energy is released when an
electron is added to the outside orbital. In addition, the more valence
electrons an element has, the more likely it is to gain electrons to form a
stable octet. The less valence electrons an atom has, the least likely it will
gain electrons.ThusThe
electron affinities of zero group of elements are positive.
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.Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons. Remember that greater the distance, the less of an attraction; thus, less energy is released when an electron is added to the outside orbital. In addition, the more valence electrons an element has, the more likely it is to gain electrons to form a stable octet. The less valence electrons an atom has, the least likely it will gain electrons.ThusThe electron affinities of zero group of elements are positive.
