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Q: Which of the following is NOT positively charged?
  • A. Alpha particle
  • B. Proton
  • C. Helium nucleus
  • D. Electron
Correct Answer: Option D - The electron was discovered by J.J. Thomson in 1897 AD. It is a negatively charged particle An electron has and revolves around the nucleus. 1.6 × 10⁻¹⁹ coulomb charge. It is a negatively charged particle, while alpha particle, protons and helium nuclei are positively charged particle.
D. The electron was discovered by J.J. Thomson in 1897 AD. It is a negatively charged particle An electron has and revolves around the nucleus. 1.6 × 10⁻¹⁹ coulomb charge. It is a negatively charged particle, while alpha particle, protons and helium nuclei are positively charged particle.

Explanations:

The electron was discovered by J.J. Thomson in 1897 AD. It is a negatively charged particle An electron has and revolves around the nucleus. 1.6 × 10⁻¹⁹ coulomb charge. It is a negatively charged particle, while alpha particle, protons and helium nuclei are positively charged particle.