Why are electrons held into the nucleus?

This is dictated by coulombic attraction.

Indeed, opposing charges attract. In this case, that means

Electrons with a negative charge will be drawn to a positively charged nucleus containing protons.

Electrons are held into the nucleus due to the electrostatic force of attraction between the negatively charged electrons and the positively charged protons in the nucleus, according to the principles of electromagnetic theory.

Electrons are held into the nucleus due to the electrostatic force of attraction between the positively charged protons in the nucleus and the negatively charged electrons. This force, known as the electromagnetic force, keeps the electrons in orbit around the nucleus, creating stable atomic structures. Additionally, quantum mechanics describes the behavior of electrons in terms of probability distributions, indicating that electrons occupy specific energy levels around the nucleus, contributing to the stability of atoms.