​Identify the True Statement(s) of Potassium's Electronic Configuration

Multiple Choice

​Identify the true statement(s) of potassium's electronic configuration.
1. Potassium atom in the lowest-energy state has its last electron in the 4s orbital.
2. Potassium atom in the lowest-energy state has its last electron in the 3d orbital.
3. The electronic configuration of potassium is 1s²2s²2p⁶3s²3p⁶3d¹.

A) ​1 only
B) ​2 only
C) ​3 only
D) ​1 and 3
E) ​2 and 3