E. ANSWER THE FOLLOWING QUESTIONS: 1. Name the element which does not possess any neutron. 2. What is the absolute mass of an electron ? 3. Define:(0) Valency (Valence Shell. 4. Who discovered cathode rays? 5. What type of charged particles were used by Rutherford in his scattering experiment? 6. What is electronic configuration ? 7. Define atom. Who gave this term ? 8. What are the basic assumptions of Dalton's Theory? 9. Compare the characteristics of electrons, protons and neutrons. 10. With the help of suitable diagram, explain scattering experiment of Rutherford.
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Explanation:
1. Protium
2. -1.6×10-19 coulombs.
3. The last shell of an atom
4. J.J. Thompson
5.alpha (α)-particles
6. the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
7. The smallest particle of a matter.
8. 1) All matter is made of atoms. Atoms are indivisible and indestructible. 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms.
9.
electons: they are negatively charged particles which revolve in orbits around the nucleus.
protons: the positively charged particles inside the nucleus
neutrons:are neutrally charged particles inside the nucleus.
10. do it yourself~~~ :))
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