What Is an Atom Made up of?

Answer

An atom is made up of three particles called electron, proton and neutron. These particles have different characteristics where, a proton has a positive electrical charge, a neutron has no electrical charge and an electron has a negative electrical charge.
1 Additional Answer
An atom consists of positively charged protons in the nucleus, neutrally charged neutrons in the nucleus, and negatively charged electrons in the electron orbitals surrounding the nucleus.
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