Which of the following statements is/are correct?

1.) The angular momentum quantum number, l, of an electron in an s orbital is always equal to 0.

2.) The magnetic quantum number, m, of an electron in a p orbital is +1,0, or -1.

3.) The principle quantum, n, of an electron in a d orbital must be equal to or greater than 3.

Quantum number in chemistry describes a particular value about the different energy levels present in any element like atom or molecule.

(1). Angular momentum quantum no. (I) describes the property of a subshell, which are present inside the shell. In every sub-shell electron have definite value of I i.e.

For s orbital : I = 0

For p orbital : I = 1

For d orbital : I = 2

For f orbital : I = 3

(2). Magnetic quantum number (m) define the value of orbitals that are present within the subshells. Its value is ranging from -I to +I. i.e.

For s orbital : m = 0

For p orbital : m = -1, 0, +1

For d orbital : m = -2, -1, 0 +1, +2

For f orbital : m = -3, -2, -1, 0 +1, +2, +3

(3). Principle quantum (n) defines about the number of shell present in an atom. In the 1st shell only s subshell is present, in the 2nd shell s & p; p subshells are present, in the 3rd shell s, p & d subshells are present and in the 4th shell s, p, d & f subshells are present. So, n of an electron in a d orbital must be equal to or greater than 3.

Hence, all given option are correct.

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