Multi-choice problem: Continue writing the next sentence in this paragraph:

How to study atomic structure
Learn about the properties of an electron.
An electron is a negatively charged particle. It is the smallest of the main three particles that comprise an atom.

Available options: (1). Ion: electrons are the electrons that structure (computing electrons). Their space, power, and electrical energy are an electron.. (2). Electrons orbit the nucleus of an atom which is made up of both protons and neutrons. The electrons are arranged in orbital shells in special configurations around the nucleus.. (3). An atoms that a atom is in charge of two electrons are the hypotenuse (electrons will produce one atom), an electron that is important for developing and implementing an atom. An electron is known as an atom separated into electrons such as radiometers or magnetision (phthalates).. (4). Observe your chalkings from tiny crevices for example: the efficacy of an atom believes oxygen to transform a mass of earth into a molecule (or particles that are composed of contions). The desire of a person to " eat " a basic, stable atom will manifest itself as a vacuum from space molecules..
(2).