Question

An orbital in which n=4,l=2 is expressed as ? A. 4s B. 4p C. 4d D. 4f​

Answer 1

An orbital with n=4 and l=2 is expressed as 4d, representing a d-orbital in the fourth energy level with five possible orientations.

Step-by-step explanation:

An orbital with n=4 and l=2 is expressed as 4d. The principal quantum number (n) represents the energy level of the electron and is the first number in the orbital designation. The azimuthal or angular momentum quantum number (l) determines the shape of the orbital and is denoted by the letters s, p, d, or f. For l=0 we have s orbitals; l=1 corresponds to p orbitals; l=2 indicates d orbitals; and l=3 signifies f orbitals. Since n=4 and l=2 in this case, the designation of the orbital is 4d, which means it is a d-orbital in the fourth energy level. There are five 4d orbitals because d orbitals can have five different values of the magnetic quantum number (ml), ranging from -2 to +2.

Answer 2

An orbital with n=4 and l=2 is expressed as a 4d orbital. So, the correct answer is C. 4d.

The quantum numbers n and l describe different characteristics of an atomic orbital in the electron cloud of an atom.

In this case, when n=4 and l=2:

- n represents the principal quantum number, which indicates the energy level or shell of the orbital. So, n=4 means it's in the fourth energy level.

- l represents the azimuthal quantum number or angular momentum quantum number, which determines the shape of the orbital. When l=2, it corresponds to a d orbital.

Therefore, an orbital with n=4 and l=2 is expressed as a 4d orbital. So, the correct answer is C. 4d.