1. What are the basic unit of matter?, atoms, proton, neutron, How to calculate the number of electrons that saturate the energy level?, 2n2, 3n2, 3n3, Particles which are negatively charged and negligible mass revolve around the nucleus..........., proton, electron, neutron, Atoms can connect together into groups and form a ..............., proton, molecule, nucleus, The atom of each element is expressed by a chemical symbol. Such as Sodium Chloride (Na), 11 23Na, 23Na11, Na2311

Atomic Structure

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