Q42 of 149 Page 192

Name the particles used by Rutherford in his experiment on the discovery of nucleus. Also state the charge on these particles.

The particle used by Rutherford in his experiment on the discovery of nucleus is known as alpha particle. +2 is the charge of the alpha particle.


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41

What is the nucleus of an atom and what is the nature of charge on it?

 41

Name the scientist who discovered the nucleus of atom

 43

An element has atomic number 13 and an atomic mass of 27.

(a) How many electrons are there in each atom of the element?


(b) How are these electrons distributed in the various energy levels?

 44

Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element?