Final answer:Electrons determine the vast majority of characteristics in an atom, including its chemical properties and reactivity. Valence electrons play a significant role in how atoms bond with others. Other factors include the number of protons and neutrons in the nucleus.Explanation:The vast majority of characteristics in an atom are determined by itselectrons. Electrons are negatively charged particles that are located in orbitals around the nucleus of an atom. The number and arrangement of electrons determine the atom's chemical properties and reactivity.For example, the number of valence electrons, which are the electrons in the outermost energy level, determines how an atom will bond with other atoms to form molecules. Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons.Other factors that can influence the characteristics of an atom include the number of protons in the nucleus, which determines the element's atomic number, and the number of neutrons, which can affect the atom's stability and its isotopes.Learn more about Characteristics in an atom here:brainly.com/question/18704391#SPJ3...

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