Element a is Lithium Li with 3 electrons, 1 valence electron, valency 1 and atomic number 3. Element b is Carbon C with 6 electrons, 4 valence electrons, valency 4 and atomic number 6. Element c is Phosphorus P with ...
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Option (ii) is the correct choice. Both statements are scientifically true, but the equality of protons and electrons explains electrical neutrality rather than providing the fundamental reason why discovering subatomic constituents clarified atomic architecture.
Electrons do not fly away because a strong electrostatic force of attraction binds them to the nucleus. The positively charged protons in the nucleus continuously pull the negatively charged orbiting electrons toward the center.
Options (ii) and (iii) are correct because alpha particle scattering revealed a tiny, dense, positive nucleus, disproving Thomson’s model. Options (i) and (iv) are incorrect because neutrons were discovered later and deflections did not trace electron movement.