These would be p block elements in group 5 (XV)
N, P, As, Sb, Bi
The element in period 3 with 8 electrons in its outermost energy level is chlorine (Cl).
3
I believe there are 3 electrons
Phosphorus has five electrons in the third energy level (n=3).
An atom with 3 electrons in level M would tend to either gain 5 electrons to complete level M or lose 3 electrons to complete the previous level. The tendency would depend on the element and its electronegativity.
The element is likely lithium (Li). Lithium has 3 electron energy levels (shells) and 3 valence electrons in its outermost energy level.
A neutral nitrogen atom has an atomic number of 7, meaning it has 7 electrons. The electron configuration for nitrogen is 1s² 2s² 2p³. Therefore, in the 2p sub-energy level, there are 3 electrons.
The element that has four electrons in energy level n=3 is arsenic (As), which has the atomic number 33. In its electron configuration, arsenic has the distribution of electrons as follows: 1s² 2s² 2p⁶ 3s² 3p³, where the 3s and 3p orbitals together account for the four electrons in the n=3 energy level.
The number beside the letter represents the energy level. The letter represents the sub level. The exponent represents the number of electrons in the sub level. So in the case of: 1s^2 1 is the energy level; S is the sub level; ^2 is the number of electrons in the sub level.
An element with 5 electrons in the third energy level has the electron configuration of 3s² 3p³. This indicates that there are 2 electrons in the 3s subshell and 3 electrons in the 3p subshell. The atomic number of this element is 15, which corresponds to phosphorus (P).
The element with five electrons in the third energy level (n=3) is phosphorus (P). In its electron configuration, phosphorus has the atomic number 15, with the distribution of electrons as 1s² 2s² 2p⁶ 3s² 3p³. Thus, it has five electrons in the third energy level (2 in the 3s subshell and 3 in the 3p subshell).
The element that fits this description is lithium. It has 3 electrons, with 2 of them in the third energy level.