The mechanical wave are of two types i.e. longitudinal wave and transverse wave. In transverse wave, the particle of medium travel in a perpendicular direction. The waves formed by an earthquake are called seismic waves.
Earthquake occurs in the form of both traverse and longitudinal waves. P - waves are longitudinal in nature while S - wave are transverse in nature.
In S - wave, the movement of ground and velocity of propagation are perpendicular to each other.
Hence, the waves formed by an earthquake is an example of transverse wave.
This primarily has to do with the balance of energy between the orbitals. The aufbau principle states that the order of energy regarding electrons in the orbitals from lowest to highest is so the electron in the atom will minimalize it's energy. Periods on the periodic table are based on the energy level while the groups have the same amount of valence electrons. The outer orbitals are refered to as shells. The elements are particularly arranged depending on their atomic and molecular orbitals. Valence electrons most determine the chemical properties of an element. The atomic number is based on the number of protons.
