Question #33d8c

1 Answer
Oct 14, 2015

The answer is (c) 9

Explanation:

Each electron shell corresponds to a different energy level, which is represented by the principal quantum number, n.

The M shell designates the third energy level, for which n=3.

![https://principlequantumnumber.wordpress.com/](useruploads.socratic.orguseruploads.socratic.org)

The relationship between the principal quantum number and the number of orbitals is given by the equation

no. of orbitals=n2

This equation will produce

n=1no. of orbitals=12=1

n=2no. of orbitals=22=4

n=3no. of orbitals=32=9

The M shell will thus contain a total of 9 orbitals

  • one 3s-orbital
  • three 3p-orbitals
  • five 3d-orbitals