Atoms are the structural unit that makes the element. The atom with two protons, four neutrons, and two electrons is best represented by the second diagram. Thus, option b is correct.
What are the sub-atomic particles?
Sub-atomic particles are the constituents of the atoms that are basic and smaller units that makes the atom. An atom comprises three sub-atomic particles namely neutron, electron, and proton.
The neutrons are said to be neutral in charge and hence have no charge over them, while the protons are said to be carrying a positive charge that together with the neutron are accumulated at the center of the atom.
The electrons are said to carry a negative charge that is supposed to be present in the shells around the nucleus of the atom. The two electrons will be placed in the shells, while two protons and four neutrons will be placed at the center of the atom.
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