Question

The electronic configuration of an element is 1s^{2}, 2s^{2} 2p^{6}, 3s^{2} 3p^{3}, which is that the number of the element which is simply below the above element within the periodic table?
A.34
B.49
C.33
D.31

Answer 1

Hint: We are provided with the electronic configuration and we have the atomic number of the element which is just below the above element in the periodic table. So, first we will discuss the electronic configuration then we will find our answer.

Complete step by step answer:

The electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is . Electronic configurations describe each electron as moving independently in an orbital, in a mean field created by all other orbitals. According to the laws of quantum physics , for systems with just one electron, A level of energy is related to each electron configuration and in certain conditions, electrons are able to move from one configuration to a different by the emission or absorption of a quantum of energy, within the sort of a photon. Knowledge of the electron configuration of various atoms is beneficial in understanding the structure of the table of elements. So, the atomic number of the above element is 2+2+6+2+3=15. Hence, the atomic number of the element below the given element is 15+18=33.

Hence the option C is the correct.

Additional information:

Electron configuration was first conceived under the Bohr model of the atom, and it's still common to talk of shells and subshells despite the advances in understanding of the quantum-mechanical nature of electrons. A group is the set of allowed states that share an equivalent principal quantum number, n (the number before the letter within the orbital label), that electrons may occupy.

Note:
The energy associated with an electron is that of its orbital. The energy of a configuration is usually approximated because the sum of the energy of every electron, neglecting the electron-electron interactions.