Answer: The first energy level (shell) of the carbon atom can hold up to 2 electrons.
Explanation: The first energy level, often referred to as the K shell, can hold a maximum of 2 electrons.
This is based on the electron capacity of the s subshell, which consists of a single s orbital that can accommodate 2 electrons.
For the carbon atom, with an atomic number of 6, the first two electrons occupy the 1s subshell in the K shell.
Significance: Understanding the capacity of energy levels and subshells helps describe the electron arrangement in atoms and predict their chemical behavior based on valence electrons in higher energy levels.