The total capacity for electrons in a 3s sublevel is 2.
Explanation: Each atomic sublevel (s, p, d, f) can hold a specific number of electrons based on its shape and the available orbitals. The ‘s’ sublevel has one orbital, and each orbital can hold a maximum of two electrons (with opposite spins). Therefore, since there is only one 3s orbital, it can accommodate a total of 2 electrons. This is a fundamental concept in atomic structure and quantum mechanics, helping to explain how electrons are arranged around an atom’s nucleus.