Answer:
3 electrons
Explanation:
The elements of group 5A of the periodic table are the following:
nitrogen, sodium, arsenic, antimony and bismuth.
To determine the amount of electrons in the last energy level we need to know the electronic configuration of each element.
Electronic configuration
N: [He] 2s2 2p3
P: 1s2 2s2 2p6 3s2 3p3
As: [Ar] 3d10 4s2 4p3
Sb: [Kr] 4d10 5s2 5p3
Bi: [Xe] 4f14 5d10 6s2 6p3
As we can see they all have 3 electrons in their last energy level
.
The electronic transition that will produce the lowest frequency is an electron falling from the 3rd to the 2nd energy level.
The question is incomplete, the complete question is;
As electrons fall from high energy orbitals to lower orbitals, energy is released in the form of electromagnetic radiation. The farther the electron falls, the more energy is released. Which of the following electronic transitions would produce a wave with the lowest frequency?
an electron falling from the 6th to the 2nd energy level
an electron falling from the 5th to the 2nd energy level
an electron falling from the 3rd to the 2nd energy level
an electron jumping from the 1st to the 2nd energy level
According to Bohr's theory, energy is absorbed or emitted when an electron moves from one energy level to another. This energy often occurs as visible light of known frequency and wavelength.
The magnitude of frequency of light depends on the difference in energy between the two energy levels. If the difference between the energy levels is high, the frequency of light is also high and vice versa.
The transition from 3rd to the 2nd energy level represents a low frequency transition because the energy levels are close together.
Learn more: brainly.com/question/10675485
When energy is needed in order for the reaction to happen, then that reaction is known as endotermic. When the reaction has as a result energy then it is exotermic. An example of an endotermic reaction would be photosynthesis, for an exotermic: combustion.
