Question

The values of the principal energy levels are:

		s, p, d, f
		IA, IIA,....VIIIA
		-1, -2, -3,....etc.
		1, 2, 3,....etc

Answer 1

The value of principle energy levels are given by: 1, 2, 3,....etc

Detailed explanation on different Energy levels, Quantam numbers, their value ranges and determination is explained below.

Energy levels are three dimensional regions around the nucleus where probablity of finding an electron under consideration is maximum. Electrons are found in different energy levels around the orbit. To define the location more specifically, quantam numbers are used. There are mainly four quantam numbers. Each electon in an atom has a unique set of three quantam numbers. They are

i) Principle Quantam Numbers (n):

They define the orbit in which the electon is present. As the value of n increases, the distance of the electron from the nucleus increases. Its value can vary from 1,2,3........etc which correspond to K,L,M,N...shell respectively.

ii) Angular Momentum Quantam numbers or Azimmuthal Quantam numbers (l):

They define the shape of the orbital or it defines the subshell to which the electron enters. Its value can vary from 0,1,2.....etc which coeersponds to s, p,d,....subshell respectively.

iii) Magnetic Quantam Numbers (m):

They define the orientation of an electron within the subshell. The total number of possible orientations in each subshell is given by (2l+1) where l is the Azimuthal quantam number. The value of m varies from -l to l ie it can also be zero, and even negative

iv) Spin Quantam Numbers (s):

Its signifies the direction of electron spin. When the electon has upward spin, it is denoted by +1/2 and if it has negative spin it is denoted by -1/2. It defines the ability of an atom to produce magnetic field.