✅ Correct Answer: Aluminum
Source: This question is taken from the Everyday Science
✅ Correct Answer: Free Electrons
✅ Correct Answer: 2 electrons
✅ Correct Answer: 7
✅ Correct Answer: Germany
✅ Correct Answer: Neon and argon
✅ Correct Answer: Zinc sulphide
✅ Correct Answer: Hardness
✅ Correct Answer: Valency
✅ Correct Answer: Law of Constant Composition
✅ Correct Answer: Spectroscopy
✅ Correct Answer: Nuclear Energy
✅ Correct Answer: Iron
✅ Correct Answer: Helium
✅ Correct Answer: 23
✅ Correct Answer: Mass Number
✅ Correct Answer: H2
✅ Correct Answer: 4
✅ Correct Answer: Protons,Neutrons & Electrons
✅ Correct Answer: Electrons