Electrons in the first energy level or first electron shell have only one orbit. This shell is also known as the K shell.

Here's why:

* Energy Levels: Electrons exist in different energy levels around the nucleus of an atom. These levels are quantized, meaning electrons can only exist at specific energy levels.

* First Energy Level: The first energy level is the closest to the nucleus and can hold a maximum of two electrons.

* Orbitals: Within each energy level, there are sub-levels called orbitals, which are regions of space where electrons are most likely to be found. The first energy level has only one sub-level, called the 1s orbital.

Examples of elements with electrons in only the first shell:

* Hydrogen (H): Has 1 electron in the 1s orbital.

* Helium (He): Has 2 electrons in the 1s orbital.

Let me know if you have any other questions about electron shells!